Regex Tester
Test regular expressions live with match highlighting. Flags included.
Private by architecture: this tool runs entirely in your browser. Nothing is uploaded anywhere.
Questions, answered.
Is my text uploaded?
No. Everything runs in your browser — safe for sensitive test data.
Which regex flavor?
JavaScript (ECMAScript) regular expressions, the same your browser uses.
What do the flags do?
g finds all matches, i ignores case, m makes ^ and $ match line boundaries.