Regex tester

1. Enter the expression (without slashes) and select the flags — g, i, m, s, u.
2. Paste your test text to see highlighted matches and the capture group table.
3. Use the replacement section with $1, $2, or $<name> to test a replacement.

This tool uses your browser's built-in regular expression engine (JavaScript/ECMAScript syntax), the same one used by Node.js and TypeScript. Named groups (?<name>...), lookbehind, and Unicode property classes (\p{L} with the u flag) are supported.

Built-in examples include patterns for common formats such as phone numbers, dates, and currency. Remember, a regex checks the format, not the content — a value can match the pattern and still be invalid.