Live matches
See every match and its character index.
Regex Tester
Test JavaScript regular expressions with flags, live matches, capture groups and replacement output.
Test text
Replace withoptional
Matches
Enter a regex to see matches.
Replacement preview
Test regular expressions online
Use this tool to test JavaScript-compatible regular expressions against sample text. Flags such as g, i, m, s, u and y are supported by your browser.
Capture groups
Inspect captured subgroups for each match.
Replace preview
Test replacement strings before using them in code.
Private
All matching runs locally in your browser.