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eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
74 lines
2.2 KiB
Markdown
74 lines
2.2 KiB
Markdown
# Disallow characters which are made with multiple code points in character class syntax (no-misleading-character-class)
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Unicode includes the characters which are made with multiple code points.
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RegExp character class syntax (`/[abc]/`) cannot handle characters which are made by multiple code points as a character; those characters will be dissolved to each code point. For example, `❇️` is made by `❇` (`U+2747`) and VARIATION SELECTOR-16 (`U+FE0F`). If this character is in RegExp character class, it will match to either `❇` (`U+2747`) or VARIATION SELECTOR-16 (`U+FE0F`) rather than `❇️`.
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This rule reports the regular expressions which include multiple code point characters in character class syntax. This rule considers the following characters as multiple code point characters.
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**A character with combining characters:**
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The combining characters are characters which belong to one of `Mc`, `Me`, and `Mn` [Unicode general categories](http://www.unicode.org/L2/L1999/UnicodeData.html#General%20Category).
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```js
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/^[Á]$/u.test("Á") //→ false
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/^[❇️]$/u.test("❇️") //→ false
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```
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**A character with Emoji modifiers:**
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```js
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/^[👶🏻]$/u.test("👶🏻") //→ false
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/^[👶🏽]$/u.test("👶🏽") //→ false
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```
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**A pair of regional indicator symbols:**
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```js
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/^[🇯🇵]$/u.test("🇯🇵") //→ false
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```
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**Characters that ZWJ joins:**
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```js
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/^[👨👩👦]$/u.test("👨👩👦") //→ false
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```
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**A surrogate pair without Unicode flag:**
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```js
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/^[👍]$/.test("👍") //→ false
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// Surrogate pair is OK if with u flag.
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/^[👍]$/u.test("👍") //→ true
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```
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## Rule Details
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This rule reports the regular expressions which include multiple code point characters in character class syntax.
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Examples of **incorrect** code for this rule:
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```js
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/*eslint no-misleading-character-class: error */
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/^[Á]$/u
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/^[❇️]$/u
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/^[👶🏻]$/u
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/^[🇯🇵]$/u
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/^[👨👩👦]$/u
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/^[👍]$/
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```
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Examples of **correct** code for this rule:
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```js
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/*eslint no-misleading-character-class: error */
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/^[abc]$/
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/^[👍]$/u
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```
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## When Not To Use It
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You can turn this rule off if you don't want to check RegExp character class syntax for multiple code point characters.
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