Free tool
Regex Tester
Build and test regular expressions with live matches, groups and flags.
/ /
Test String
Matches
0 matches
Matches will appear here...
Code Generation
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01Type a pattern
Enter your regex and toggle the flags you need.
02Paste test text
Drop in the strings you want to match against.
03Read the matches
See matches and capture groups highlight live.
flags g i m s capture groups live match
What regex flavor does this use?
The JavaScript (ECMAScript) engine, so patterns follow JavaScript syntax.
How do the flags work?
g finds every match, i ignores case, m makes ^ and $ match line breaks, and s lets . match newlines.
Is anything sent to a server?
No. Everything runs in your browser, so your patterns and test text stay private.
Is it free?
Yes, completely free with no signup and no limits.