Regex Tester

Test regular expressions in real time with visual match highlighting, capture groups, and flag toggles (g, i, m, s).

Loading interactive Regex Tester interface...

How to Use Regex Tester

  1. Enter your regular expression pattern.
  2. Toggle flags: Global (g), Case-insensitive (i), Multiline (m), DotAll (s).
  3. Paste your test string.
  4. Matches and capture groups highlight dynamically in real time.

Frequently Asked Questions

Which regex engine does this use?

It runs the ECMAScript RegExp engine native to your browser.

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