disallow empty character classes in regular expressions (no-empty-character-class)

禁止在正则表达式中出现空字符集 (no-empty-character-class)

Because empty character classes in regular expressions do not match anything, they might be typing mistakes.


var foo = /^abc[]/;

Rule Details

This rule disallows empty character classes in regular expressions.


Examples of incorrect code for this rule:

错误 代码示例:

/*eslint no-empty-character-class: "error"*/

/^abc[]/.test("abcdefg"); // false
"abcdefg".match(/^abc[]/); // null

Examples of correct code for this rule:

正确 代码示例:

/*eslint no-empty-character-class: "error"*/

/^abc/.test("abcdefg"); // true
"abcdefg".match(/^abc/); // ["abc"]

/^abc[a-z]/.test("abcdefg"); // true
"abcdefg".match(/^abc[a-z]/); // ["abcd"]

Known Limitations

This rule does not report empty character classes in the string argument of calls to the RegExp constructor.

该规则不会报告 RegExp 构造函数的字符串参数中空字符集的使用情况。

Example of a false negative when this rule reports correct code:


/*eslint no-empty-character-class: "error"*/

var abcNeverMatches = new RegExp("^abc[]");


This rule was introduced in ESLint 0.22.0.

该规则在 ESLint 0.22.0 中被引入。