Tool4SaaS

Regex Tester

Test and debug JavaScript regular expressions. Match patterns, toggle flags, and see results offline.

Enter a JavaScript-style regex pattern.

Matches (0)

No matches yet.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .

Frequently asked questions

Standard JavaScript regular expressions, with g, i, m and s flags.

No. Matching happens entirely in your browser.

Yes, all processing happens locally in your browser and nothing is uploaded.

How to use Regex Tester

  1. Enter pattern: Type your regular expression and choose flags.
  2. Paste test text: Paste the text to test against.
  3. Review matches: Read the list of matches and their positions.