Which regex flavour does it use?

JavaScript (ECMAScript) regex, matching what runs in browsers and Node.js — lookaheads, named groups and Unicode classes included.

How are matches shown?

Every match highlights in the test text with its index; capture groups list separately so you can verify extraction logic.

Greedy quantifiers (.*) grab as much as possible — try lazy versions (.*?) or character classes and check the highlight as you edit.

Yes — toggle g, i, m, s and u flags; the tool re-runs and re-highlights instantly, including match counts.

Test regex patterns live with matches highlighted. Build and debug regular expressions.

Test and debug regular expressions in real-time.

AI Regex Generator

Regular Expression

Flags

Test String

1Enter your regular expression and flags (g, i, m) in the pattern field.
2Paste your test text below the pattern.
3All matches highlight instantly, with capture groups listed per match.
4Iterate on the pattern until the right parts light up, then copy the final regex.