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Regex Tester

Test your regular expressions in real-time. See matches highlighted, verify capturing groups, and find errors quickly.

Regular Expression
Enter your regex pattern
Test String
Enter text to test against your pattern
Matches
No matches

Enter a pattern and test string to see matches

How to use
  1. 1Enter your regex pattern
  2. 2Add test text to test the pattern
  3. 3See matches, groups and explanations in real-time
Features
  • Live Matching

    See instantly which parts match as you write the pattern.

  • Capture Groups

    Shows all capturing groups and their values.

  • Flags Support

    Supports all flags: g (global), i (case-insensitive), m (multiline), s, u, y.

  • Error Checking

    Clear error messages for invalid regex.

FAQ

What do the flags mean?

g = find all matches. i = ignore case. m = ^ and $ match line start/end. s = . matches newlines too.

How do I test email validation?

Use: /^[^\s@]+@[^\s@]+\.[^\s@]+$/ for simple validation. For full RFC compliance, regex is too complex.

What are Capturing Groups?

Parentheses () create groups you can extract. Example: /(\d{3})-(\d{4})/ matches '123-4567' and extracts '123' and '4567'.

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