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node_modules/stylelint/docs/user-guide/rules/about.md
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# About rules
The built-in rules:
- apply to standard CSS syntax only
- are generally useful; not tied to idiosyncratic patterns
- have a clear and unambiguous finished state
- have a singular purpose
- are standalone, and don't rely on another rule
- do not contain functionality that overlaps with another rule
In contrast, a plugin is a community rule that doesn't adhere to all these criteria. It might support a particular methodology or toolset, or apply to _non-standard_ constructs and features, or be for specific use cases.
## Options
Each rule accepts a primary and an optional secondary option.
### Primary
Every rule _must have_ a primary option. For example, in:
- `"color-hex-case": "upper"`, the primary option is `"upper"`
- `"indentation": [2, { "except": ["block"] }]`, the primary option is `2`
### Secondary
Some rules require extra flexibility to address edge cases. These can use an optional secondary options object. For example, in:
- `"color-hex-case": "upper"` there is no secondary options object
- `"indentation": [2, { "except": ["block"] }]`, the secondary options object is `{ "except": ["block"] }`
The most typical secondary options are `"ignore": []` and `"except": []`.
#### Keyword `"ignore"` and `"except"`
The `"ignore"` and `"except"` options accept an array of predefined keyword options, e.g. `["relative", "first-nested", "descendant"]`:
- `"ignore"` skips-over a particular pattern
- `"except"` inverts the primary option for a particular pattern
#### User-defined `"ignore*"`
Some rules accept a _user-defined_ list of things to ignore. This takes the form of `"ignore<Things>": []`, e.g. `"ignoreAtRules": []`.
The `ignore*` options let users ignore non-standard syntax at the _configuration level_. For example, the:
- `:global` and `:local` pseudo-classes introduced in CSS Modules
- `@debug` and `@extend` at-rules introduced in SCSS
Methodologies and language extensions come and go quickly, and this approach ensures our codebase does not become littered with code for obsolete things.
## Names
Rule are consistently named, they are:
- made up of lowercase words separated by hyphens
- split into two parts
The first part describes what [_thing_](http://apps.workflower.fi/vocabs/css/en) the rule applies to. The second part describes what the rule is checking.
For example:
```
"number-leading-zero"
// ↑ ↑
// the thing what the rule is checking
```
There is no first part when the rule applies to the whole stylesheet.
For example:
```
"no-eol-whitespace"
"indentation"
// ↑
// what the rules are checking
```
_Rules are named to encourage explicit, rather than implicit, options._ For example, `color-hex-case: "upper"|"lower"` rather than `color-hex-uppercase: "always"|"never"`. As `color-hex-uppercase: "never"` _implies_ always lowercase, whereas `color-hex-case: "lower"` makes it _explicit_.
### No rules
Most rules require _or_ disallow something.
For example, whether numbers _must_ or _must not_ have a leading zero:
- `number-leading-zero`: `string - "always"|"never"`
- `"always"` - there _must always_ be a leading zero
- `"never"` - there _must never_ be a leading zero
<!-- prettier-ignore -->
```css
a { line-height: 0.5; }
/** ↑
* This leading zero */
```
However, some rules _just disallow_ something. These rules include `*-no-*` in their name.
For example, to disallow empty blocks:
- `block-no-empty` - blocks _must not_ be empty
<!-- prettier-ignore -->
```css
a { }
/** ↑
* Blocks like this */
```
Notice how it does not make sense to have an option to enforce the opposite, i.e. that every block _must_ be empty.
### Max and min rules
`*-max-*` and `*-min-*` rules _set a limit_ to something.
For example, specifying the maximum number of digits after the "." in a number:
- `number-max-precision`: `int`
<!-- prettier-ignore -->
```css
a { font-size: 1.333em; }
/** ↑
* The maximum number of digits after this "." */
```
### Whitespace rules
Whitespace rules allow you to enforce an empty line, a single space, a newline or no space in some specific part of the stylesheet.
The whitespace rules combine two sets of keywords:
- `before`, `after` and `inside` to specify where the whitespace (if any) is expected
- `empty-line`, `space` and `newline` to specify whether a single empty line, a single space, a single newline or no space is expected there
For example, specifying if a single empty line or no space must come before all the comments in a stylesheet:
- `comment-empty-line-before`: `string` - `"always"|"never"`
<!-- prettier-ignore -->
```css
a {}
←
/* comment */ ↑
↑
/** ↑
* This empty line */
```
Additionally, some whitespace rules use an additional set of keywords:
- `comma`, `colon`, `semicolon`, `opening-brace`, `closing-brace`, `opening-parenthesis`, `closing-parenthesis`, `operator` or `range-operator` are used if a specific piece of punctuation in the _thing_ is being targeted
For example, specifying if a single space or no space must follow a comma in a function:
- `function-comma-space-after`: `string` - `"always"|"never"`
<!-- prettier-ignore -->
```css
a { transform: translate(1, 1) }
/** ↑
* The space after this commas */
```
The plural of the punctuation is used for `inside` rules. For example, specifying if a single space or no space must be inside the parentheses of a function:
- `function-parentheses-space-inside`: `string` - `"always"|"never"`
<!-- prettier-ignore -->
```css
a { transform: translate( 1, 1 ); }
/** ↑ ↑
* The space inside these two parentheses */
```
## READMEs
Each rule is accompanied by a README in the following format:
1. Rule name.
2. Single-line description.
3. Prototypical code example.
4. Expanded description (if necessary).
5. Options.
6. Example patterns that are considered violations (for each option value).
7. Example patterns that are _not_ considered violations (for each option value).
8. Optional options (if applicable).
The single-line description is in the form of:
- "Disallow ..." for `no` rules
- "Limit ..." for `max` rules
- "Require ..." for rules that accept `"always"` and `"never"` options
- "Specify ..." for everything else
## Violation messages
Each rule produces violation messages in these forms:
- "Expected \[something\] \[in some context\]"
- "Unexpected \[something\] \[in some context\]"
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# Combining rules
You can combine rules to enforce strict conventions.
## `*-newline/space-before` and `*-newline/space-after` rules
Say you want to enforce no space before and a single space after the colon in every declaration:
<!-- prettier-ignore -->
```css
a { color: pink; }
/** ↑
* No space before and a single space after this colon */
```
You can enforce that with:
```json
{
"declaration-colon-space-after": "always",
"declaration-colon-space-before": "never"
}
```
Some _things_ (e.g. declaration blocks and value lists) can span more than one line. In these cases, `newline` rules and extra options can be used to provide flexibility.
For example, this is the complete set of `value-list-comma-*` rules and their options:
- `value-list-comma-space-after`: `"always"|"never"|"always-single-line"|"never-single-line"`
- `value-list-comma-space-before`: `"always"|"never"|"always-single-line"|"never-single-line"`
- `value-list-comma-newline-after`: `"always"|"always-multi-line|"never-multi-line"`
- `value-list-comma-newline-before`: `"always"|"always-multi-line"|"never-multi-line"`
Where `*-multi-line` and `*-single-line` are in reference to the value list (the _thing_). For example, given:
<!-- prettier-ignore -->
```css
a,
b {
color: red;
font-family: sans, serif, monospace; /* single-line value list */
} ↑ ↑
/** ↑ ↑
* The value list starts here and ends here */
```
There is only a single-line value list in this example. The selector is multi-line, as is the declaration block and, as such, also the rule. But the value list isn't. The `*-multi-line` and `*-single-line` refer to the value list in the context of this rule.
### Example A
Say you only want to allow single-line value lists. And you want to enforce no space before and a single space after the commas:
<!-- prettier-ignore -->
```css
a {
font-family: sans, serif, monospace;
box-shadow: 1px 1px 1px red, 2px 2px 1px 1px blue inset, 2px 2px 1px 2px blue inset;
}
```
You can enforce that with:
```json
{
"value-list-comma-space-after": "always",
"value-list-comma-space-before": "never"
}
```
### Example B
Say you want to allow both single-line and multi-line value lists. You want there to be a single space after the commas in the single-line lists and no space before the commas in both the single-line and multi-line lists:
<!-- prettier-ignore -->
```css
a {
font-family: sans, serif, monospace; /* single-line value list with space after, but no space before */
box-shadow: 1px 1px 1px red, /* multi-line value list ... */
2px 2px 1px 1px blue inset, /* ... with newline after, ... */
2px 2px 1px 2px blue inset; /* ... but no space before */
}
```
You can enforce that with:
```json
{
"value-list-comma-newline-after": "always-multi-line",
"value-list-comma-space-after": "always-single-line",
"value-list-comma-space-before": "never"
}
```
### Example C
Say you want to allow both single-line and multi-line value lists. You want there to be no space before the commas in the single-line lists and always a space after the commas in both lists:
<!-- prettier-ignore -->
```css
a {
font-family: sans, serif, monospace;
box-shadow: 1px 1px 1px red
, 2px 2px 1px 1px blue inset
, 2px 2px 1px 2px blue inset;
}
```
You can enforce that with:
```json
{
"value-list-comma-newline-before": "always-multi-line",
"value-list-comma-space-after": "always",
"value-list-comma-space-before": "never-single-line"
}
```
### Example D
The rules are flexible enough to enforce entirely different conventions for single-line and multi-line lists. Say you want to allow both single-line and multi-line value lists. You want the single-line lists to have a single space before and after the colons. Whereas you want the multi-line lists to have a single newline before the commas, but no space after:
<!-- prettier-ignore -->
```css
a {
font-family: sans , serif , monospace; /* single-line list with a single space before and after the comma */
box-shadow: 1px 1px 1px red /* multi-line list ... */
,2px 2px 1px 1px blue inset /* ... with newline before, ... */
,2px 2px 1px 2px blue inset; /* ... but no space after the comma */
}
```
You can enforce that with:
```json
{
"value-list-comma-newline-after": "never-multi-line",
"value-list-comma-newline-before": "always-multi-line",
"value-list-comma-space-after": "always-single-line",
"value-list-comma-space-before": "always-single-line"
}
```
### Example E
Say you want to disable single-line blocks:
<!-- prettier-ignore -->
```css
a { color: red; }
/** ↑
* Declaration blocks like this */
```
Use the `block-opening-brace-newline-after` and `block-opening-brace-newline-before` rules together. For example, this config:
```json
{
"block-opening-brace-newline-after": ["always"],
"block-closing-brace-newline-before": ["always"]
}
```
Would allow:
<!-- prettier-ignore -->
```css
a {
color: red;
}
```
But not these patterns:
<!-- prettier-ignore -->
```css
a { color: red;
}
a {
color: red; }
a { color: red; }
```
To allow single-line blocks but enforce newlines with multi-line blocks, use the `"always-multi-line"` option for both rules.
## `*-empty-line-before` and `*-max-empty-lines` rules
These rules work together to control where empty lines are allowed.
Each _thing_ is responsible for pushing itself away from the _preceding thing_, rather than pushing the _subsequent thing_ away. This consistency is to avoid conflicts and is why there aren't any `*-empty-line-after` rules in stylelint.
Say you want to enforce the following:
<!-- prettier-ignore -->
```css
a {
background: green;
color: red;
@media (min-width: 30em) {
color: blue;
}
}
b {
--custom-property: green;
background: pink;
color: red;
}
```
You can do that with:
```json
{
"at-rule-empty-line-before": [
"always",
{
"except": ["first-nested"]
}
],
"custom-property-empty-line-before": [
"always",
{
"except": ["after-custom-property", "first-nested"]
}
],
"declaration-empty-line-before": [
"always",
{
"except": ["after-declaration", "first-nested"]
}
],
"block-closing-brace-empty-line-before": "never",
"rule-empty-line-before": ["always-multi-line"]
}
```
We recommend that you set your primary option (e.g. `"always"` or `"never"`) to whatever is your most common occurrence and define your exceptions with the `except` optional secondary options. There are many values for the `except` option e.g. `first-nested`, `after-comment` etc.
The `*-empty-line-before` rules control whether there must never be an empty line or whether there must be _one or more_ empty lines before a _thing_. The `*-max-empty-lines` rules complement this by controlling _the number_ of empty lines within _things_. The `max-empty-lines` rule sets a limit across the entire source. A _stricter_ limit can then be set within _things_ using the likes of `function-max-empty-lines`, `selector-max-empty-lines` and `value-list-max-empty-lines`.
For example, say you want to enforce the following:
<!-- prettier-ignore -->
```css
a,
b {
box-shadow:
inset 0 2px 0 #dcffa6,
0 2px 5px #000;
}
c {
transform:
translate(
1,
1
);
}
```
i.e. a maximum of 1 empty line within the whole source, but no empty lines within functions, selector lists and value lists.
You can do that with:
```json
{
"function-max-empty-lines": 0,
"max-empty-lines": 1,
"selector-list-max-empty-lines": 0,
"value-list-max-empty-lines": 0
}
```
## `*-allowed-list`, `*-disallowed-list`, `color-named` and applicable `*-no-*` rules
These rules work together to (dis)allow language features and constructs.
There are `*-allowed-list` and `*-disallowed-list` rules that target the constructs of the CSS language: at-rules, functions, declarations (i.e. property-value pairs), properties and units. These rules (dis)allow any language features that make use of these constructs (e.g. `@media`, `rgb()`). However, there are features not caught by these `*-allowed-list` and `*-disallowed-list` rules (or are, but would require complex regex to configure). There are individual rules, usually a `*-no-*` rule (e.g. `color-no-hex` and `selector-no-id`), to disallow each of these features.
Say you want to disallow the `@debug` language extension. You can do that using either the `at-rule-disallowed-list` or `at-rule-allowed-list` rules because the `@debug` language extension uses the at-rule construct e.g.
```json
{
"at-rule-disallowed-list": ["debug"]
}
```
Say you want to, for whatever reason, disallow the whole at-rule construct. You can do that using:
```json
{
"at-rule-allowed-list": []
}
```
Say you want to disallow the value `none` for the `border` properties. You can do that using either the `declaration-property-value-disallowed-list` or `declaration-property-value-allowed-list` e.g.
```json
{
"declaration-property-value-disallowed-list": [
{
"/^border/": ["none"]
}
]
}
```
## `color-*` and `function-*` rules
Most `<color>` values are _functions_. As such, they can be (dis)allowed using either the `function-allowed-list` or `function-disallowed-list` rules. Two other color representations aren't functions: named colors and hex colors. There are two specific rules that (dis)allow these: `color-named` and `color-no-hex`, respectively.
Say you want to enforce using a named color _if one exists for your chosen color_ and use `hwb` color if one does not, e.g.:
<!-- prettier-ignore -->
```css
a {
background: hwb(235, 0%, 0%); /* there is no named color equivalent for this color */
color: black;
}
```
If you're taking an allow approach, you can do that with:
```json
{
"color-named": "always-where-possible",
"color-no-hex": true,
"function-allowed-list": ["hwb"]
}
```
Or, if you're taking a disallow approach:
```json
{
"color-named": "always-where-possible",
"color-no-hex": true,
"function-disallowed-list": ["/^rgb/", "/^hsl/", "gray"]
}
```
This approach scales to when language extensions (that use the two built-in extendable syntactic constructs of at-rules and functions) are used. For example, say you want to disallow all standard color presentations in favour of using a custom color representation function, e.g. `my-color(red with a dash of green / 5%)`. You can do that with:
```json
{
"color-named": "never",
"color-no-hex": true,
"function-allowed-list": ["my-color"]
}
```
## Manage conflicts
Each rule stands alone, so sometimes it's possible to configure rules such that they conflict with one another. For example, you could turn on two conflicting allow and disallow list rules, e.g. `unit-allowed-list` and `unit-disallowed-list`.
It's your responsibility as the configuration author to resolve these conflicts.
node_modules/stylelint/docs/user-guide/rules/list.md
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# List of rules
Grouped first by the following categories and then by the [_thing_](http://apps.workflower.fi/vocabs/css/en) they apply to.
- [Possible errors](#possible-errors)
- [Limit language features](#limit-language-features)
- [Stylistic issues](#stylistic-issues)
## Possible errors
### Color
- [`color-no-invalid-hex`](../../../lib/rules/color-no-invalid-hex/README.md): Disallow invalid hex colors.
### Font family
- [`font-family-no-duplicate-names`](../../../lib/rules/font-family-no-duplicate-names/README.md): Disallow duplicate font family names.
- [`font-family-no-missing-generic-family-keyword`](../../../lib/rules/font-family-no-missing-generic-family-keyword/README.md): Disallow missing generic families in lists of font family names.
### Named grid areas
- [`named-grid-areas-no-invalid`](../../../lib/rules/named-grid-areas-no-invalid/README.md): Disallow invalid named grid areas.
### Function
- [`function-calc-no-invalid`](../../../lib/rules/function-calc-no-invalid/README.md): Disallow an invalid expression within `calc` functions.
- [`function-calc-no-unspaced-operator`](../../../lib/rules/function-calc-no-unspaced-operator/README.md): Disallow an unspaced operator within `calc` functions.
- [`function-linear-gradient-no-nonstandard-direction`](../../../lib/rules/function-linear-gradient-no-nonstandard-direction/README.md): Disallow direction values in `linear-gradient()` calls that are not valid according to the [standard syntax](https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient#Syntax).
### String
- [`string-no-newline`](../../../lib/rules/string-no-newline/README.md): Disallow (unescaped) newlines in strings.
### Unit
- [`unit-no-unknown`](../../../lib/rules/unit-no-unknown/README.md): Disallow unknown units.
### Property
- [`property-no-unknown`](../../../lib/rules/property-no-unknown/README.md): Disallow unknown properties.
### Keyframe declaration
- [`keyframe-declaration-no-important`](../../../lib/rules/keyframe-declaration-no-important/README.md): Disallow `!important` within keyframe declarations.
### Declaration block
- [`declaration-block-no-duplicate-custom-properties`](../../../lib/rules/declaration-block-no-duplicate-custom-properties/README.md): Disallow duplicate custom properties within declaration blocks.
- [`declaration-block-no-duplicate-properties`](../../../lib/rules/declaration-block-no-duplicate-properties/README.md): Disallow duplicate properties within declaration blocks.
- [`declaration-block-no-shorthand-property-overrides`](../../../lib/rules/declaration-block-no-shorthand-property-overrides/README.md): Disallow shorthand properties that override related longhand properties.
### Block
- [`block-no-empty`](../../../lib/rules/block-no-empty/README.md): Disallow empty blocks.
### Selector
- [`selector-pseudo-class-no-unknown`](../../../lib/rules/selector-pseudo-class-no-unknown/README.md): Disallow unknown pseudo-class selectors.
- [`selector-pseudo-element-no-unknown`](../../../lib/rules/selector-pseudo-element-no-unknown/README.md): Disallow unknown pseudo-element selectors.
- [`selector-type-no-unknown`](../../../lib/rules/selector-type-no-unknown/README.md): Disallow unknown type selectors.
### Media feature
- [`media-feature-name-no-unknown`](../../../lib/rules/media-feature-name-no-unknown/README.md): Disallow unknown media feature names.
### At-rule
- [`at-rule-no-unknown`](../../../lib/rules/at-rule-no-unknown/README.md): Disallow unknown at-rules.
### Comment
- [`comment-no-empty`](../../../lib/rules/comment-no-empty/README.md): Disallow empty comments.
### General / Sheet
- [`no-descending-specificity`](../../../lib/rules/no-descending-specificity/README.md): Disallow selectors of lower specificity from coming after overriding selectors of higher specificity.
- [`no-duplicate-at-import-rules`](../../../lib/rules/no-duplicate-at-import-rules/README.md): Disallow duplicate `@import` rules within a stylesheet.
- [`no-duplicate-selectors`](../../../lib/rules/no-duplicate-selectors/README.md): Disallow duplicate selectors within a stylesheet.
- [`no-empty-source`](../../../lib/rules/no-empty-source/README.md): Disallow empty sources.
- [`no-extra-semicolons`](../../../lib/rules/no-extra-semicolons/README.md): Disallow extra semicolons (Autofixable).
- [`no-invalid-double-slash-comments`](../../../lib/rules/no-invalid-double-slash-comments/README.md): Disallow double-slash comments (`//...`) which are not supported by CSS.
- [`no-invalid-position-at-import-rule`](../../../lib/rules/no-invalid-position-at-import-rule/README.md): Disallow invalid position `@import` rules within a stylesheet.
## Limit language features
### Alpha-value
- [`alpha-value-notation`](../../../lib/rules/alpha-value-notation/README.md): Specify percentage or number notation for alpha-values (Autofixable).
### Hue
- [`hue-degree-notation`](../../../lib/rules/hue-degree-notation/README.md): Specify number or angle notation for degree hues (Autofixable).
### Color
- [`color-function-notation`](../../../lib/rules/color-function-notation/README.md): Specify modern or legacy notation for applicable color-functions (Autofixable).
- [`color-named`](../../../lib/rules/color-named/README.md): Require (where possible) or disallow named colors.
- [`color-no-hex`](../../../lib/rules/color-no-hex/README.md): Disallow hex colors.
### Length
- [`length-zero-no-unit`](../../../lib/rules/length-zero-no-unit/README.md): Disallow units for zero lengths (Autofixable).
### Font weight
- [`font-weight-notation`](../../../lib/rules/font-weight-notation/README.md): Require numeric or named (where possible) `font-weight` values. Also, when named values are expected, require only valid names.
### Function
- [`function-allowed-list`](../../../lib/rules/function-allowed-list/README.md): Specify a list of allowed functions.
- [`function-blacklist`](../../../lib/rules/function-blacklist/README.md): Specify a list of disallowed functions. **(deprecated)**
- [`function-disallowed-list`](../../../lib/rules/function-disallowed-list/README.md): Specify a list of disallowed functions.
- [`function-url-no-scheme-relative`](../../../lib/rules/function-url-no-scheme-relative/README.md): Disallow scheme-relative urls.
- [`function-url-scheme-allowed-list`](../../../lib/rules/function-url-scheme-allowed-list/README.md): Specify a list of allowed URL schemes.
- [`function-url-scheme-blacklist`](../../../lib/rules/function-url-scheme-blacklist/README.md): Specify a list of disallowed URL schemes. **(deprecated)**
- [`function-url-scheme-disallowed-list`](../../../lib/rules/function-url-scheme-disallowed-list/README.md): Specify a list of disallowed URL schemes.
- [`function-url-scheme-whitelist`](../../../lib/rules/function-url-scheme-whitelist/README.md): Specify a list of allowed URL schemes. **(deprecated)**
- [`function-whitelist`](../../../lib/rules/function-whitelist/README.md): Specify a list of allowed functions. **(deprecated)**
### Keyframes
- [`keyframes-name-pattern`](../../../lib/rules/keyframes-name-pattern/README.md): Specify a pattern for keyframe names.
### Number
- [`number-max-precision`](../../../lib/rules/number-max-precision/README.md): Limit the number of decimal places allowed in numbers.
### Time
- [`time-min-milliseconds`](../../../lib/rules/time-min-milliseconds/README.md): Specify the minimum number of milliseconds for time values.
### Unit
- [`unit-allowed-list`](../../../lib/rules/unit-allowed-list/README.md): Specify a list of allowed units.
- [`unit-blacklist`](../../../lib/rules/unit-blacklist/README.md): Specify a list of disallowed units. **(deprecated)**
- [`unit-disallowed-list`](../../../lib/rules/unit-disallowed-list/README.md): Specify a list of disallowed units.
- [`unit-whitelist`](../../../lib/rules/unit-whitelist/README.md): Specify a list of allowed units. **(deprecated)**
### Shorthand property
- [`shorthand-property-no-redundant-values`](../../../lib/rules/shorthand-property-no-redundant-values/README.md): Disallow redundant values in shorthand properties (Autofixable).
### Value
- [`value-no-vendor-prefix`](../../../lib/rules/value-no-vendor-prefix/README.md): Disallow vendor prefixes for values (Autofixable).
### Custom property
- [`custom-property-pattern`](../../../lib/rules/custom-property-pattern/README.md): Specify a pattern for custom properties.
### Property
- [`property-allowed-list`](../../../lib/rules/property-allowed-list/README.md): Specify a list of allowed properties.
- [`property-blacklist`](../../../lib/rules/property-blacklist/README.md): Specify a list of disallowed properties. **(deprecated)**
- [`property-disallowed-list`](../../../lib/rules/property-disallowed-list/README.md): Specify a list of disallowed properties.
- [`property-no-vendor-prefix`](../../../lib/rules/property-no-vendor-prefix/README.md): Disallow vendor prefixes for properties (Autofixable).
- [`property-whitelist`](../../../lib/rules/property-whitelist/README.md): Specify a list of allowed properties. **(deprecated)**
### Declaration
- [`declaration-block-no-redundant-longhand-properties`](../../../lib/rules/declaration-block-no-redundant-longhand-properties/README.md): Disallow longhand properties that can be combined into one shorthand property.
- [`declaration-no-important`](../../../lib/rules/declaration-no-important/README.md): Disallow `!important` within declarations.
- [`declaration-property-unit-allowed-list`](../../../lib/rules/declaration-property-unit-allowed-list/README.md): Specify a list of allowed property and unit pairs within declarations.
- [`declaration-property-unit-blacklist`](../../../lib/rules/declaration-property-unit-blacklist/README.md): Specify a list of disallowed property and unit pairs within declarations. **(deprecated)**
- [`declaration-property-unit-disallowed-list`](../../../lib/rules/declaration-property-unit-disallowed-list/README.md): Specify a list of disallowed property and unit pairs within declarations.
- [`declaration-property-unit-whitelist`](../../../lib/rules/declaration-property-unit-whitelist/README.md): Specify a list of allowed property and unit pairs within declarations. **(deprecated)**
- [`declaration-property-value-allowed-list`](../../../lib/rules/declaration-property-value-allowed-list/README.md): Specify a list of allowed property and value pairs within declarations.
- [`declaration-property-value-blacklist`](../../../lib/rules/declaration-property-value-blacklist/README.md): Specify a list of disallowed property and value pairs within declarations. **(deprecated)**
- [`declaration-property-value-disallowed-list`](../../../lib/rules/declaration-property-value-disallowed-list/README.md): Specify a list of disallowed property and value pairs within declarations.
- [`declaration-property-value-whitelist`](../../../lib/rules/declaration-property-value-whitelist/README.md): Specify a list of allowed property and value pairs within declarations. **(deprecated)**
### Declaration block
- [`declaration-block-single-line-max-declarations`](../../../lib/rules/declaration-block-single-line-max-declarations/README.md): Limit the number of declarations within a single-line declaration block.
### Selector
- [`selector-attribute-name-disallowed-list`](../../../lib/rules/selector-attribute-name-disallowed-list/README.md): Specify a list of disallowed attribute names.
- [`selector-attribute-operator-allowed-list`](../../../lib/rules/selector-attribute-operator-allowed-list/README.md): Specify a list of allowed attribute operators.
- [`selector-attribute-operator-blacklist`](../../../lib/rules/selector-attribute-operator-blacklist/README.md): Specify a list of disallowed attribute operators. **(deprecated)**
- [`selector-attribute-operator-disallowed-list`](../../../lib/rules/selector-attribute-operator-disallowed-list/README.md): Specify a list of disallowed attribute operators.
- [`selector-attribute-operator-whitelist`](../../../lib/rules/selector-attribute-operator-whitelist/README.md): Specify a list of allowed attribute operators. **(deprecated)**
- [`selector-class-pattern`](../../../lib/rules/selector-class-pattern/README.md): Specify a pattern for class selectors.
- [`selector-combinator-allowed-list`](../../../lib/rules/selector-combinator-allowed-list/README.md): Specify a list of allowed combinators.
- [`selector-combinator-blacklist`](../../../lib/rules/selector-combinator-blacklist/README.md): Specify a list of disallowed combinators. **(deprecated)**
- [`selector-combinator-disallowed-list`](../../../lib/rules/selector-combinator-disallowed-list/README.md): Specify a list of disallowed combinators.
- [`selector-combinator-whitelist`](../../../lib/rules/selector-combinator-whitelist/README.md): Specify a list of allowed combinators. **(deprecated)**
- [`selector-disallowed-list`](../../../lib/rules/selector-disallowed-list/README.md): Specify a list of disallowed selectors.
- [`selector-id-pattern`](../../../lib/rules/selector-id-pattern/README.md): Specify a pattern for ID selectors.
- [`selector-max-attribute`](../../../lib/rules/selector-max-attribute/README.md): Limit the number of attribute selectors in a selector.
- [`selector-max-class`](../../../lib/rules/selector-max-class/README.md): Limit the number of classes in a selector.
- [`selector-max-combinators`](../../../lib/rules/selector-max-combinators/README.md): Limit the number of combinators in a selector.
- [`selector-max-compound-selectors`](../../../lib/rules/selector-max-compound-selectors/README.md): Limit the number of compound selectors in a selector.
- [`selector-max-empty-lines`](../../../lib/rules/selector-max-empty-lines/README.md): Limit the number of adjacent empty lines within selectors (Autofixable).
- [`selector-max-id`](../../../lib/rules/selector-max-id/README.md): Limit the number of ID selectors in a selector.
- [`selector-max-pseudo-class`](../../../lib/rules/selector-max-pseudo-class/README.md): Limit the number of pseudo-classes in a selector.
- [`selector-max-specificity`](../../../lib/rules/selector-max-specificity/README.md): Limit the specificity of selectors.
- [`selector-max-type`](../../../lib/rules/selector-max-type/README.md): Limit the number of type in a selector.
- [`selector-max-universal`](../../../lib/rules/selector-max-universal/README.md): Limit the number of universal selectors in a selector.
- [`selector-nested-pattern`](../../../lib/rules/selector-nested-pattern/README.md): Specify a pattern for the selectors of rules nested within rules.
- [`selector-no-qualifying-type`](../../../lib/rules/selector-no-qualifying-type/README.md): Disallow qualifying a selector by type.
- [`selector-no-vendor-prefix`](../../../lib/rules/selector-no-vendor-prefix/README.md): Disallow vendor prefixes for selectors (Autofixable).
- [`selector-pseudo-class-allowed-list`](../../../lib/rules/selector-pseudo-class-allowed-list/README.md): Specify a list of allowed pseudo-class selectors.
- [`selector-pseudo-class-blacklist`](../../../lib/rules/selector-pseudo-class-blacklist/README.md): Specify a list of disallowed pseudo-class selectors. **(deprecated)**
- [`selector-pseudo-class-disallowed-list`](../../../lib/rules/selector-pseudo-class-disallowed-list/README.md): Specify a list of disallowed pseudo-class selectors.
- [`selector-pseudo-class-whitelist`](../../../lib/rules/selector-pseudo-class-whitelist/README.md): Specify a list of allowed pseudo-class selectors. **(deprecated)**
- [`selector-pseudo-element-allowed-list`](../../../lib/rules/selector-pseudo-element-allowed-list/README.md): Specify a list of allowed pseudo-element selectors.
- [`selector-pseudo-element-blacklist`](../../../lib/rules/selector-pseudo-element-blacklist/README.md): Specify a list of disallowed pseudo-element selectors. **(deprecated)**
- [`selector-pseudo-element-colon-notation`](../../../lib/rules/selector-pseudo-element-colon-notation/README.md): Specify single or double colon notation for applicable pseudo-elements (Autofixable).
- [`selector-pseudo-element-disallowed-list`](../../../lib/rules/selector-pseudo-element-disallowed-list/README.md): Specify a list of disallowed pseudo-element selectors.
- [`selector-pseudo-element-whitelist`](../../../lib/rules/selector-pseudo-element-whitelist/README.md): Specify a list of allowed pseudo-element selectors. **(deprecated)**
### Media feature
- [`media-feature-name-allowed-list`](../../../lib/rules/media-feature-name-allowed-list/README.md): Specify a list of allowed media feature names.
- [`media-feature-name-blacklist`](../../../lib/rules/media-feature-name-blacklist/README.md): Specify a list of disallowed media feature names. **(deprecated)**
- [`media-feature-name-disallowed-list`](../../../lib/rules/media-feature-name-disallowed-list/README.md): Specify a list of disallowed media feature names.
- [`media-feature-name-no-vendor-prefix`](../../../lib/rules/media-feature-name-no-vendor-prefix/README.md): Disallow vendor prefixes for media feature names (Autofixable).
- [`media-feature-name-value-allowed-list`](../../../lib/rules/media-feature-name-value-allowed-list/README.md): Specify a list of allowed media feature name and value pairs.
- [`media-feature-name-value-whitelist`](../../../lib/rules/media-feature-name-value-whitelist/README.md): Specify a list of allowed media feature name and value pairs. **(deprecated)**
- [`media-feature-name-whitelist`](../../../lib/rules/media-feature-name-whitelist/README.md): Specify a list of allowed media feature names. **(deprecated)**
### Custom media
- [`custom-media-pattern`](../../../lib/rules/custom-media-pattern/README.md): Specify a pattern for custom media query names.
### At-rule
- [`at-rule-allowed-list`](../../../lib/rules/at-rule-allowed-list/README.md): Specify a list of allowed at-rules.
- [`at-rule-blacklist`](../../../lib/rules/at-rule-blacklist/README.md): Specify a list of disallowed at-rules. **(deprecated)**
- [`at-rule-disallowed-list`](../../../lib/rules/at-rule-disallowed-list/README.md): Specify a list of disallowed at-rules.
- [`at-rule-no-vendor-prefix`](../../../lib/rules/at-rule-no-vendor-prefix/README.md): Disallow vendor prefixes for at-rules (Autofixable).
- [`at-rule-property-required-list`](../../../lib/rules/at-rule-property-required-list/README.md): Specify a list of required properties for an at-rule.
- [`at-rule-property-requirelist`](../../../lib/rules/at-rule-property-requirelist/README.md): Specify a list of required properties for an at-rule. **(deprecated)**
- [`at-rule-whitelist`](../../../lib/rules/at-rule-whitelist/README.md): Specify a list of allowed at-rules. **(deprecated)**
### Comment
- [`comment-pattern`](../../../lib/rules/comment-pattern/README.md): Specify a pattern for comments.
- [`comment-word-blacklist`](../../../lib/rules/comment-word-blacklist/README.md): Specify a list of disallowed words within comments. **(deprecated)**
- [`comment-word-disallowed-list`](../../../lib/rules/comment-word-disallowed-list/README.md): Specify a list of disallowed words within comments.
### General / Sheet
- [`max-nesting-depth`](../../../lib/rules/max-nesting-depth/README.md): Limit the depth of nesting.
- [`no-unknown-animations`](../../../lib/rules/no-unknown-animations/README.md): Disallow unknown animations.
## Stylistic issues
### Color
- [`color-hex-case`](../../../lib/rules/color-hex-case/README.md): Specify lowercase or uppercase for hex colors (Autofixable).
- [`color-hex-length`](../../../lib/rules/color-hex-length/README.md): Specify short or long notation for hex colors (Autofixable).
### Font family
- [`font-family-name-quotes`](../../../lib/rules/font-family-name-quotes/README.md): Specify whether or not quotation marks should be used around font family names.
### Function
- [`function-comma-newline-after`](../../../lib/rules/function-comma-newline-after/README.md): Require a newline or disallow whitespace after the commas of functions (Autofixable).
- [`function-comma-newline-before`](../../../lib/rules/function-comma-newline-before/README.md): Require a newline or disallow whitespace before the commas of functions (Autofixable).
- [`function-comma-space-after`](../../../lib/rules/function-comma-space-after/README.md): Require a single space or disallow whitespace after the commas of functions (Autofixable).
- [`function-comma-space-before`](../../../lib/rules/function-comma-space-before/README.md): Require a single space or disallow whitespace before the commas of functions (Autofixable).
- [`function-max-empty-lines`](../../../lib/rules/function-max-empty-lines/README.md): Limit the number of adjacent empty lines within functions (Autofixable).
- [`function-name-case`](../../../lib/rules/function-name-case/README.md): Specify lowercase or uppercase for function names (Autofixable).
- [`function-parentheses-newline-inside`](../../../lib/rules/function-parentheses-newline-inside/README.md): Require a newline or disallow whitespace on the inside of the parentheses of functions (Autofixable).
- [`function-parentheses-space-inside`](../../../lib/rules/function-parentheses-space-inside/README.md): Require a single space or disallow whitespace on the inside of the parentheses of functions (Autofixable).
- [`function-url-quotes`](../../../lib/rules/function-url-quotes/README.md): Require or disallow quotes for urls.
- [`function-whitespace-after`](../../../lib/rules/function-whitespace-after/README.md): Require or disallow whitespace after functions (Autofixable).
### Number
- [`number-leading-zero`](../../../lib/rules/number-leading-zero/README.md): Require or disallow a leading zero for fractional numbers less than 1 (Autofixable).
- [`number-no-trailing-zeros`](../../../lib/rules/number-no-trailing-zeros/README.md): Disallow trailing zeros in numbers (Autofixable).
### String
- [`string-quotes`](../../../lib/rules/string-quotes/README.md): Specify single or double quotes around strings (Autofixable).
### Unit
- [`unit-case`](../../../lib/rules/unit-case/README.md): Specify lowercase or uppercase for units (Autofixable).
### Value
- [`value-keyword-case`](../../../lib/rules/value-keyword-case/README.md): Specify lowercase or uppercase for keywords values (Autofixable).
### Value list
- [`value-list-comma-newline-after`](../../../lib/rules/value-list-comma-newline-after/README.md): Require a newline or disallow whitespace after the commas of value lists (Autofixable).
- [`value-list-comma-newline-before`](../../../lib/rules/value-list-comma-newline-before/README.md): Require a newline or disallow whitespace before the commas of value lists.
- [`value-list-comma-space-after`](../../../lib/rules/value-list-comma-space-after/README.md): Require a single space or disallow whitespace after the commas of value lists (Autofixable).
- [`value-list-comma-space-before`](../../../lib/rules/value-list-comma-space-before/README.md): Require a single space or disallow whitespace before the commas of value lists (Autofixable).
- [`value-list-max-empty-lines`](../../../lib/rules/value-list-max-empty-lines/README.md): Limit the number of adjacent empty lines within value lists (Autofixable).
### Custom property
- [`custom-property-empty-line-before`](../../../lib/rules/custom-property-empty-line-before/README.md): Require or disallow an empty line before custom properties (Autofixable).
### Property
- [`property-case`](../../../lib/rules/property-case/README.md): Specify lowercase or uppercase for properties (Autofixable).
### Declaration
- [`declaration-bang-space-after`](../../../lib/rules/declaration-bang-space-after/README.md): Require a single space or disallow whitespace after the bang of declarations (Autofixable).
- [`declaration-bang-space-before`](../../../lib/rules/declaration-bang-space-before/README.md): Require a single space or disallow whitespace before the bang of declarations (Autofixable).
- [`declaration-colon-newline-after`](../../../lib/rules/declaration-colon-newline-after/README.md): Require a newline or disallow whitespace after the colon of declarations (Autofixable).
- [`declaration-colon-space-after`](../../../lib/rules/declaration-colon-space-after/README.md): Require a single space or disallow whitespace after the colon of declarations (Autofixable).
- [`declaration-colon-space-before`](../../../lib/rules/declaration-colon-space-before/README.md): Require a single space or disallow whitespace before the colon of declarations (Autofixable).
- [`declaration-empty-line-before`](../../../lib/rules/declaration-empty-line-before/README.md): Require or disallow an empty line before declarations (Autofixable).
### Declaration block
- [`declaration-block-semicolon-newline-after`](../../../lib/rules/declaration-block-semicolon-newline-after/README.md): Require a newline or disallow whitespace after the semicolons of declaration blocks (Autofixable).
- [`declaration-block-semicolon-newline-before`](../../../lib/rules/declaration-block-semicolon-newline-before/README.md): Require a newline or disallow whitespace before the semicolons of declaration blocks.
- [`declaration-block-semicolon-space-after`](../../../lib/rules/declaration-block-semicolon-space-after/README.md): Require a single space or disallow whitespace after the semicolons of declaration blocks (Autofixable).
- [`declaration-block-semicolon-space-before`](../../../lib/rules/declaration-block-semicolon-space-before/README.md): Require a single space or disallow whitespace before the semicolons of declaration blocks (Autofixable).
- [`declaration-block-trailing-semicolon`](../../../lib/rules/declaration-block-trailing-semicolon/README.md): Require or disallow a trailing semicolon within declaration blocks (Autofixable).
### Block
- [`block-closing-brace-empty-line-before`](../../../lib/rules/block-closing-brace-empty-line-before/README.md): Require or disallow an empty line before the closing brace of blocks (Autofixable).
- [`block-closing-brace-newline-after`](../../../lib/rules/block-closing-brace-newline-after/README.md): Require a newline or disallow whitespace after the closing brace of blocks (Autofixable).
- [`block-closing-brace-newline-before`](../../../lib/rules/block-closing-brace-newline-before/README.md): Require a newline or disallow whitespace before the closing brace of blocks (Autofixable).
- [`block-closing-brace-space-after`](../../../lib/rules/block-closing-brace-space-after/README.md): Require a single space or disallow whitespace after the closing brace of blocks.
- [`block-closing-brace-space-before`](../../../lib/rules/block-closing-brace-space-before/README.md): Require a single space or disallow whitespace before the closing brace of blocks (Autofixable).
- [`block-opening-brace-newline-after`](../../../lib/rules/block-opening-brace-newline-after/README.md): Require a newline after the opening brace of blocks (Autofixable).
- [`block-opening-brace-newline-before`](../../../lib/rules/block-opening-brace-newline-before/README.md): Require a newline or disallow whitespace before the opening brace of blocks (Autofixable).
- [`block-opening-brace-space-after`](../../../lib/rules/block-opening-brace-space-after/README.md): Require a single space or disallow whitespace after the opening brace of blocks (Autofixable).
- [`block-opening-brace-space-before`](../../../lib/rules/block-opening-brace-space-before/README.md): Require a single space or disallow whitespace before the opening brace of blocks (Autofixable).
### Selector
- [`selector-attribute-brackets-space-inside`](../../../lib/rules/selector-attribute-brackets-space-inside/README.md): Require a single space or disallow whitespace on the inside of the brackets within attribute selectors (Autofixable).
- [`selector-attribute-operator-space-after`](../../../lib/rules/selector-attribute-operator-space-after/README.md): Require a single space or disallow whitespace after operators within attribute selectors (Autofixable).
- [`selector-attribute-operator-space-before`](../../../lib/rules/selector-attribute-operator-space-before/README.md): Require a single space or disallow whitespace before operators within attribute selectors (Autofixable).
- [`selector-attribute-quotes`](../../../lib/rules/selector-attribute-quotes/README.md): Require or disallow quotes for attribute values.
- [`selector-combinator-space-after`](../../../lib/rules/selector-combinator-space-after/README.md): Require a single space or disallow whitespace after the combinators of selectors (Autofixable).
- [`selector-combinator-space-before`](../../../lib/rules/selector-combinator-space-before/README.md): Require a single space or disallow whitespace before the combinators of selectors (Autofixable).
- [`selector-descendant-combinator-no-non-space`](../../../lib/rules/selector-descendant-combinator-no-non-space/README.md): Disallow non-space characters for descendant combinators of selectors (Autofixable).
- [`selector-pseudo-class-case`](../../../lib/rules/selector-pseudo-class-case/README.md): Specify lowercase or uppercase for pseudo-class selectors (Autofixable).
- [`selector-pseudo-class-parentheses-space-inside`](../../../lib/rules/selector-pseudo-class-parentheses-space-inside/README.md): Require a single space or disallow whitespace on the inside of the parentheses within pseudo-class selectors (Autofixable).
- [`selector-pseudo-element-case`](../../../lib/rules/selector-pseudo-element-case/README.md): Specify lowercase or uppercase for pseudo-element selectors (Autofixable).
- [`selector-type-case`](../../../lib/rules/selector-type-case/README.md): Specify lowercase or uppercase for type selectors (Autofixable).
### Selector list
- [`selector-list-comma-newline-after`](../../../lib/rules/selector-list-comma-newline-after/README.md): Require a newline or disallow whitespace after the commas of selector lists (Autofixable).
- [`selector-list-comma-newline-before`](../../../lib/rules/selector-list-comma-newline-before/README.md): Require a newline or disallow whitespace before the commas of selector lists (Autofixable).
- [`selector-list-comma-space-after`](../../../lib/rules/selector-list-comma-space-after/README.md): Require a single space or disallow whitespace after the commas of selector lists (Autofixable).
- [`selector-list-comma-space-before`](../../../lib/rules/selector-list-comma-space-before/README.md): Require a single space or disallow whitespace before the commas of selector lists (Autofixable).
### Rule
- [`rule-empty-line-before`](../../../lib/rules/rule-empty-line-before/README.md): Require or disallow an empty line before rules (Autofixable).
### Media feature
- [`media-feature-colon-space-after`](../../../lib/rules/media-feature-colon-space-after/README.md): Require a single space or disallow whitespace after the colon in media features (Autofixable).
- [`media-feature-colon-space-before`](../../../lib/rules/media-feature-colon-space-before/README.md): Require a single space or disallow whitespace before the colon in media features (Autofixable).
- [`media-feature-name-case`](../../../lib/rules/media-feature-name-case/README.md): Specify lowercase or uppercase for media feature names (Autofixable).
- [`media-feature-parentheses-space-inside`](../../../lib/rules/media-feature-parentheses-space-inside/README.md): Require a single space or disallow whitespace on the inside of the parentheses within media features (Autofixable).
- [`media-feature-range-operator-space-after`](../../../lib/rules/media-feature-range-operator-space-after/README.md): Require a single space or disallow whitespace after the range operator in media features (Autofixable).
- [`media-feature-range-operator-space-before`](../../../lib/rules/media-feature-range-operator-space-before/README.md): Require a single space or disallow whitespace before the range operator in media features (Autofixable).
### Media query list
- [`media-query-list-comma-newline-after`](../../../lib/rules/media-query-list-comma-newline-after/README.md): Require a newline or disallow whitespace after the commas of media query lists (Autofixable).
- [`media-query-list-comma-newline-before`](../../../lib/rules/media-query-list-comma-newline-before/README.md): Require a newline or disallow whitespace before the commas of media query lists.
- [`media-query-list-comma-space-after`](../../../lib/rules/media-query-list-comma-space-after/README.md): Require a single space or disallow whitespace after the commas of media query lists (Autofixable).
- [`media-query-list-comma-space-before`](../../../lib/rules/media-query-list-comma-space-before/README.md): Require a single space or disallow whitespace before the commas of media query lists (Autofixable).
### At-rule
- [`at-rule-empty-line-before`](../../../lib/rules/at-rule-empty-line-before/README.md): Require or disallow an empty line before at-rules (Autofixable).
- [`at-rule-name-case`](../../../lib/rules/at-rule-name-case/README.md): Specify lowercase or uppercase for at-rules names (Autofixable).
- [`at-rule-name-newline-after`](../../../lib/rules/at-rule-name-newline-after/README.md): Require a newline after at-rule names.
- [`at-rule-name-space-after`](../../../lib/rules/at-rule-name-space-after/README.md): Require a single space after at-rule names (Autofixable).
- [`at-rule-semicolon-newline-after`](../../../lib/rules/at-rule-semicolon-newline-after/README.md): Require a newline after the semicolon of at-rules (Autofixable).
- [`at-rule-semicolon-space-before`](../../../lib/rules/at-rule-semicolon-space-before/README.md): Require a single space or disallow whitespace before the semicolons of at-rules.
### Comment
- [`comment-empty-line-before`](../../../lib/rules/comment-empty-line-before/README.md): Require or disallow an empty line before comments (Autofixable).
- [`comment-whitespace-inside`](../../../lib/rules/comment-whitespace-inside/README.md): Require or disallow whitespace on the inside of comment markers (Autofixable).
### General / Sheet
- [`indentation`](../../../lib/rules/indentation/README.md): Specify indentation (Autofixable).
- [`linebreaks`](../../../lib/rules/linebreaks/README.md): Specify unix or windows linebreaks (Autofixable).
- [`max-empty-lines`](../../../lib/rules/max-empty-lines/README.md): Limit the number of adjacent empty lines (Autofixable).
- [`max-line-length`](../../../lib/rules/max-line-length/README.md): Limit the length of a line.
- [`no-eol-whitespace`](../../../lib/rules/no-eol-whitespace/README.md): Disallow end-of-line whitespace (Autofixable).
- [`no-missing-end-of-source-newline`](../../../lib/rules/no-missing-end-of-source-newline/README.md): Disallow missing end-of-source newlines (Autofixable).
- [`no-empty-first-line`](../../../lib/rules/no-empty-first-line/README.md): Disallow empty first lines (Autofixable).
- [`unicode-bom`](../../../lib/rules/unicode-bom/README.md): Require or disallow Unicode BOM.
- [`no-irregular-whitespace`](../../../lib/rules/no-irregular-whitespace/README.md): Disallow irregular whitespace.
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# Using regex in rules
The following classes of rules support regex:
- `*-allowed-list`
- `*-disallowed-list`
- `*-pattern`
As does the `ignore*` secondary options.
## Enforce a case
You can use the regex that corresponds to your chosen case convention:
<!-- prettier-ignore -->
- kebab-case: `^([a-z][a-z0-9]*)(-[a-z0-9]+)*$`
- lowerCamelCase: `^[a-z][a-zA-Z0-9]+$`
- snake\_case: `^([a-z][a-z0-9]*)(_[a-z0-9]+)*$`
- UpperCamelCase: `^[A-Z][a-zA-Z0-9]+$`
For example, for lowerCamelCase class selectors use `"selector-class-pattern": "^[a-z][a-zA-Z0-9]+$"`.
All these patterns disallow CSS identifiers that start with a digit, two hyphens, or a hyphen followed by a digit.
## Enforce a prefix
You can ensure a prefix by using a positive lookbehind regex.
For example, to ensure all custom properties begin with `my-` use `"custom-property-pattern": "(?<=my-)"`.