#prefer-regex-literals

#Configuration

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

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'prefer-regex-literals': 'error',
    },
  },
]);

#Rule Details

This rule disallows RegExp constructor calls when the same regular expression can be written as a literal.

Examples of incorrect code for this rule:

new RegExp("abc");
RegExp("abc", "u");
new RegExp(String.raw`^\d\.$`);

Examples of correct code for this rule:

/abc/;
/abc/u;

new RegExp(pattern);
RegExp("abc", flags);
new RegExp(prefix + "abc");

#Options

This rule accepts an options object with the following property:

• disallowRedundantWrapping (boolean, default false) — when true, additionally reports regex literals that are unnecessarily wrapped in a RegExp constructor.

To enable this option:

{ "prefer-regex-literals": ["error", { "disallowRedundantWrapping": true }] }

Examples of incorrect code for this rule with { "disallowRedundantWrapping": true }:

new RegExp(/abc/);
new RegExp(/abc/, "u");

Examples of correct code for this rule with { "disallowRedundantWrapping": true }:

/abc/;
/abc/u;
new RegExp(/abc/, flags);

#Differences from ESLint

• rslint does not vary suggestions by configured ECMAScript version; a diagnostic is still reported when the pattern arguments are static.

#Original Documentation

• ESLint prefer-regex-literals