Regex Tester

Test JavaScript regular expressions live. Matches highlight in the text, capture groups list below. No signup.

Test string

Matches & groups

Ready.

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Regex Tester

Build and debug JavaScript regular expressions interactively. Change the pattern or input, see matches update live, including capture groups and their indexes.

Flags

g — global (find all matches)
i — case-insensitive
m — multiline (^ and $ match line boundaries)
s — dotall (. matches newlines)
u — Unicode
y — sticky

This uses JavaScript's native regex engine, which matches ECMAScript 2024 spec. Patterns from other languages (Python, PHP, Perl) may differ slightly.