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Regex Tester & DebuggerDeveloper

Test, debug, and preview regular expressions in real-time with capture group extraction, flags, and replacement.
Common patterns

Regular expression

//g

Flags

56 chars·6 words·1 line
Substitution
Match results
2 matches
Match #1 (Index: 14)
support@utils24x7.com
Group $1:support
Group $2:utils24x7.com
Match #2 (Index: 39)
hello@example.org
Group $1:hello
Group $2:example.org
Accepts:
RegExp PatternTest String
Outputs:
Match Groups & Indices

Capabilities & How-To Guide

Instructions, supported options, and client-side privacy guarantee.

Regular expressions (RegEx) match character combinations in strings. Test patterns in real-time and inspect captured groups without leaving your browser.

Standard Flags Reference

  • g (global): Don't return after first match
  • i (ignoreCase): Case-insensitive matching
  • m (multiline): ^ and $ match begin/end of each line
  • s (dotAll): . matches any character including newline
  • u (unicode): Treat pattern as Unicode code points
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