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Regex Tester
Processed Locally
Test regular expressions with real-time matching and highlighting
Enter your pattern (without delimiters)
Flags
Frequently Asked Questions
Yes! All regex testing happens locally in your browser. We never upload your data to our servers. Your patterns and test strings remain completely private.
This tool uses JavaScript regular expressions (ECMAScript). Most common regex patterns work, but some features specific to other languages (like Python or Perl) may not be available.
g (global) finds all matches, i (case-insensitive) ignores letter case, m (multiline) treats ^ and $ as line boundaries, s (dotAll) makes . match newlines too.
Yes! The tool shows all capture groups for each match. Use parentheses () in your pattern to create capture groups.