Regex Tester
Free online regex tester and debugger. Test regular expressions with live match highlighting, capture group display, and multi-line support. Instant results.
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Test String
Matches (highlighted)
Match List
Frequently Asked Questions
What regex flags are supported?
The regex tester supports all standard JavaScript regex flags: global (g), case-insensitive (i), multiline (m), dotAll (s), and unicode (u).
Does it show capture groups?
Yes. All capture groups and named groups are displayed separately for each match, making it easy to debug complex patterns.
Can I test multi-line patterns?
Yes. Enable the multiline flag to make ^ and $ match start/end of each line.