#no-useless-escape

#Configuration

import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-useless-escape': 'error',
    },
  },
]);

Disallow unnecessary escape characters.

Escaping non-special characters in strings, template literals, and regular expressions does not change behavior. Removing the redundant \ keeps the code simpler and avoids confusion.

let foo = "hol\a"; // > foo = "hola"
let bar = `${foo}\!`; // > bar = "hola!"
let baz = /\:/; // same as /:/

#Rule Details

This rule flags escapes that can be safely removed without changing behavior.

Examples of incorrect code for this rule:

"\'";
'\"';
"\#";
"\e";
`\"`;
`\"${foo}\"`;
`\#{foo}`;
/\!/;
/\@/;
/[\[]/;
/[a-z\-]/;

Examples of correct code for this rule:

"\"";
'\'';
"\x12";
"©";
"\371";
"xsℑ";
`\``;
`\${${foo}}`;
`$\{${foo}}`;
/\\/g;
/\t/g;
/\w\$\*\^\./;
/[[]/;
/[\]]/;
/[a-z-]/;

#Options

This rule has an object option:

• allowRegexCharacters — array of characters whose \X form is always allowed inside regular expressions, even when the \ would otherwise be flagged. Useful for characters like - where the explicit escape can prevent the pattern from drifting into a range as the class grows.

#allowRegexCharacters

Examples of incorrect code for the { "allowRegexCharacters": ["-"] } option:

{ "no-useless-escape": ["error", { "allowRegexCharacters": ["-"] }] }

/\!/;
/\@/;
/[a-z\^]/;

Examples of correct code for the { "allowRegexCharacters": ["-"] } option:

{ "no-useless-escape": ["error", { "allowRegexCharacters": ["-"] }] }

/[0\-]/;
/[\-9]/;
/a\-b/;

#When Not To Use It

If you do not want to be notified about unnecessary escapes, you can safely disable this rule.

#Original Documentation

• no-useless-escape