better-regex.md

Improve regexes by making them shorter, consistent, and safer

💼 This rule is enabled in the ✅ recommended config.

🔧 This rule is automatically fixable by the --fix CLI option.

Note: This rule uses regexp-tree and clean-regexp under the hood.

Fail

const regex = /[0-9]/;
const regex = /[^0-9]/;
const regex = /[a-zA-Z0-9_]/;
const regex = /[a-z0-9_]/i;
const regex = /[^a-zA-Z0-9_]/;
const regex = /[^a-z0-9_]/i;
const regex = /[0-9]\.[a-zA-Z0-9_]\-[^0-9]/i;

Pass

const regex = /\d/;
const regex = /\D/;
const regex = /\w/;
const regex = /\w/i;
const regex = /\W/;
const regex = /\W/i;
const regex = /\d\.\w\-\D/i;

Options

sortCharacterClasses

Type: boolean
Default: true

Disables optimizations that affect the sorting of character classes. For example, preserves the order of the characters in [AaQqTt] rather than sorting it to [AQTaqt].