Regex Tester

Type your pattern between the slashes, toggle the flags you want, and paste your test text. Every match lights up in the text, with its position and any capture groups listed below. It updates live as you edit either the pattern or the text.

The standard JavaScript flags: g (global, find all matches), i (ignore case), m (multiline, so ^ and $ match line starts and ends), s (dotall, so . matches newlines), u (unicode), and y (sticky). Toggle them with the chips or type them directly.

If your code is JavaScript or TypeScript, yes: this tester uses the exact RegExp engine your browser ships, so a pattern that matches here matches in your JS. Other languages (Python, PCRE, Go) share most syntax but differ on edge cases like lookbehind and named groups, so double check those.

Each match lists its captured groups as $1, $2, and so on, in order. Wrap part of your pattern in parentheses to capture it. That is how you pull a specific piece (like the domain out of an email) rather than just the whole match.

No. The pattern runs against your text entirely in your browser, so log lines, sample data, or anything sensitive you are matching against never leaves your device.