Disallow characters which are made with multiple code points in character class syntax (no-misleading-character-class)

不允许在字符类语法中出现由多个代码点组成的字符 (no-misleading-character-class)

The "extends": "eslint:recommended" property in a configuration file enables this rule.

配置文件中的 "extends": "eslint:recommended" 属性启用了此规则。

Unicode includes the characters which are made with multiple code points. 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 ❇️.

Unicode 包括由多个代码点组成的字符。RegExp 字符类语法 (/[abc]/) 不能处理由多个代码点组成的字符；这些字符将被分解到每个代码点。例如，❇️ 是由 ❇ (U+2747) 和 VARIATION SELECTOR-16 (U+FE0F)。如果这是正则表达式字符类，它将匹配 ❇ (U+2747) 或 VARIATION SELECTOR-16 (U+FE0F)而不是 ❇️。

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.

此规则报告在字符类语法中包含多个代码点字符的正则表达式。此规则将以下字符视为多个代码点字符。

A character with combining characters:

组合字符的字符：

The combining characters are characters which belong to one of Mc, Me, and Mn Unicode general categories.

组合字符属于 Mc、Me 和 Mn Unicode 通用类别 之一。

/^[Á]$/u.test("Á") //→ false
/^[❇️]$/u.test("❇️") //→ false

A character with Emoji modifiers:

带有表情符号修饰符的字符：

/^[👶🏻]$/u.test("👶🏻") //→ false
/^[👶🏽]$/u.test("👶🏽") //→ false

A pair of regional indicator symbols:

一组区域指标符号：

/^[🇯🇵]$/u.test("🇯🇵") //→ false

Characters that ZWJ joins:

ZWJ（Zero Width Joiner）连接的字符：

/^[👨‍👩‍👦]$/u.test("👨‍👩‍👦") //→ false

A surrogate pair without Unicode flag:

没有 Unicode 标志的 Surrogate pair：

/^[👍]$/.test("👍") //→ false

// Surrogate pair is OK if with u flag.
/^[👍]$/u.test("👍") //→ true

Rule Details

This rule reports the regular expressions which include multiple code point characters in character class syntax.

此规则报告在字符类语法中包含多个代码点字符的正则表达式。

Examples of incorrect code for this rule:

错误 代码示例：

/*eslint no-misleading-character-class: error */

/^[Á]$/u
/^[❇️]$/u
/^[👶🏻]$/u
/^[🇯🇵]$/u
/^[👨‍👩‍👦]$/u
/^[👍]$/

Examples of correct code for this rule:

正确 代码示例：

/*eslint no-misleading-character-class: error */

/^[abc]$/
/^[👍]$/u

When Not To Use It

You can turn this rule off if you don’t want to check RegExp character class syntax for multiple code point characters.

如果不想检查多个代码点字符的 RegExp 字符类语法，可以关闭此规则。

Version

This rule was introduced in ESLint 5.3.0.

该规则在 ESLint 5.3.0 被引入。

Resources