Regex Tester
Test, debug, and validate regular expressions with real-time matching, group highlighting, and flag support
How to Use This Tool
Enter your regular expression in the pattern field.
Toggle flags: g (global), i (case-insensitive), m (multiline).
Paste test text — matches are highlighted in real time.
Use Common Patterns sidebar for quick inserts (email, URL, phone, etc.).
About This Tool
Regex Tester is a real-time regex testing tool. All matches are highlighted with detailed match info in a structured table. Toggle flags, view capture groups, and use the common patterns sidebar. A plain-English description explains what your regex does.
Frequently Asked Questions
g: find all matches. i: ignore case. m: make ^/$ match line boundaries. s: make . match newlines. u: full Unicode matching.
This uses JavaScript's regex engine. Most basic patterns work across languages, but test in your target language for edge cases.
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