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eb39fafa4f
includes a (minimal) working wrapper Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
45 lines
1.0 KiB
Markdown
45 lines
1.0 KiB
Markdown
# disallow empty character classes in regular expressions (no-empty-character-class)
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Because empty character classes in regular expressions do not match anything, they might be typing mistakes.
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```js
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var foo = /^abc[]/;
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```
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## Rule Details
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This rule disallows empty character classes in regular expressions.
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Examples of **incorrect** code for this rule:
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```js
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/*eslint no-empty-character-class: "error"*/
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/^abc[]/.test("abcdefg"); // false
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"abcdefg".match(/^abc[]/); // null
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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-empty-character-class: "error"*/
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/^abc/.test("abcdefg"); // true
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"abcdefg".match(/^abc/); // ["abc"]
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/^abc[a-z]/.test("abcdefg"); // true
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"abcdefg".match(/^abc[a-z]/); // ["abcd"]
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```
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## Known Limitations
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This rule does not report empty character classes in the string argument of calls to the `RegExp` constructor.
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Example of a *false negative* when this rule reports correct code:
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```js
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/*eslint no-empty-character-class: "error"*/
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var abcNeverMatches = new RegExp("^abc[]");
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```
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