Regex Tester
REGULAR EXPRESSION PATTERNFlags: /gimu/
//
Evaluating pattern…
Quick tokens:
Test String
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Precision Regular Expression Engine
Test, debug, and verify complex regex patterns with instant visual feedback, capture group isolation, and safe execution entirely inside your browser.
Capture Group InspectorDetailed breakdown of positional ($1, $2) and named (?<name>) groups per match with character span offsets.
Real-Time String ReplacementTest replacement expressions using standard substitution tokens ($1, $2, $&) before applying them in production code.
Using Regex Tester
Enter a JavaScript regular expression and test text, then inspect matches and capture groups. Keep patterns and inputs small when exploring expensive expressions.