Regex Tester (JavaScript)

Test JavaScript (ECMAScript) regular expressions with real-time match highlighting and group capture display. Other flavours (PCRE, Python, Go) differ. All client-side.

Runs entirely in your browserNothing is uploadedOpen in workspace →

JavaScript (ECMAScript) regex flavour only: PCRE, Python and Go syntax differ (lookbehind, named groups, possessive quantifiers and so on).

Pattern

g i m s

Test String

Matches

Enter a pattern and test string above

Match Groups

#	Match	Index	Groups