Regex Tester

Test regular expressions with flags, matches and capture groups — safely in your browser.

Regex Workspace

Processed locally · oversized runs are cancelled

● Ready

Pattern

Flags

Test text

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Matches

How do I test a regular expression?

Enter a pattern, optional flags (g, i, m, s, u), and sample text, then run the test to see matches and groups.

Pathological patterns can be expensive. This tool cancels runs that take too long so your browser stays responsive.