Regex Tester
Test regular expressions with Go/RE2 or JavaScript engines. See matches, groups, and captures in real time.
JavaScript mode — supports lookahead, lookbehind, and backreferences. Named groups:
(?<name>...), non-capturing: (?:...). Matches capped at 100.Go/RE2 mode — no backreferences or lookahead. Named groups:
(?P<name>...), non-capturing: (?:...). Matches capped at 100.PCRE2 mode — full PCRE2: lookahead, lookbehind, backreferences, atomic groups, conditionals. Named groups:
(?P<name>...) or (?<name>...). Runs in your browser via WebAssembly. Matches capped at 100.