Regular Expression Tester

Test regex patterns, flags, and capture groups in real time.

Pattern
Flags
Input text

Matches

About this tool

This regex tester helps developers and security teams validate regular expressions quickly. It runs fully in-browser and displays capture groups and match positions for fast debugging.

Common use cases

  • Validate email, URL, token, or log parsing patterns.
  • Debug capture groups for parser and ETL pipelines.
  • Prototype validation rules before app integration.

How it works

  1. Enter your regex pattern and flags.
  2. Paste test text.
  3. Run to see all matches and groups instantly.

FAQ

Does this support global matching?
Yes. Add the g flag to iterate over all matches.

Is my text uploaded?
No. Pattern processing is done locally in your browser.