regexControlCharacterEscapes

Reports control characters that are not escaped using standard escape sequences.

✅ This rule is included in the ts logical and logicalStrict presets.

Enforces consistent escaping of control characters in regular expressions by requiring standard escape sequences (\0, \t, \n, \v, \f, \r) instead of hex, unicode, or control character escapes.

Examples

Hex Escapes

❌ Incorrect

const pattern = /\x0a/;

✅ Correct

const pattern = /\n/;

Unicode Escapes

❌ Incorrect

const pattern = /\u000a/;

✅ Correct

const pattern = /\n/;

Control Character Escapes

❌ Incorrect

const pattern = /\cJ/;

✅ Correct

const pattern = /\n/;

Unicode Code Point Escapes

❌ Incorrect

const pattern = /\u{a}/u;

✅ Correct

const pattern = /\n/u;

Options

This rule is not configurable.

When Not To Use It

If your codebase has an established convention of using hex or unicode escapes for control characters, or if you need consistency with generated code that uses these formats, you may disable this rule.

Further Reading

• MDN: Character escape
• MDN: Regular expressions

Equivalents in Other Linters

• ESLint: regexp/control-character-escape