noEmptyCharacterClassInRegex

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Diagnostic Category: lint/correctness/noEmptyCharacterClassInRegex

JavaScript (and super languages)

Since: v1.3.0

Sources:

Same as: no-empty-character-class

Description

Disallow empty character classes in regular expression literals.

Empty character classes don’t match anything. In contrast, negated empty classes match any character. They are often the result of a typing mistake.

Examples

Invalid

/^a[]/.test("a"); // false

code-block.js:1:4 lint/correctness/noEmptyCharacterClassInRegex ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The regular expression includes this empty character class.
  
  > 1 │ /^a[]/.test(“a”); // false
      │    ^^
    2 │ 
  
  ℹ Empty character classes don’t match anything.
    If you want to match against [, escape it \[.
    Otherwise, remove the character class or fill it.

/^a[^]/.test("ax"); // true

code-block.js:1:4 lint/correctness/noEmptyCharacterClassInRegex ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The regular expression includes this negated empty character class.
  
  > 1 │ /^a[^]/.test(“ax”); // true
      │    ^^^
    2 │ 
  
  ℹ Negated empty character classes match anything.
    If you want to match against [, escape it \[.
    Otherwise, remove the character class or fill it.

Valid

/^a[xy]/.test("ay"); // true

/^a[^xy]/.test("ab"); // true

/^a\[]/.test("a[]"); // true

How to configure

{
  "linter": {
    "rules": {
      "correctness": {
        "noEmptyCharacterClassInRegex": "error"
      }
    }
  }
}