Is the regex tester free?

Yes, completely free with no signup required.

All regex testing runs in your browser using JavaScript's RegExp engine. Your file never leaves your browser.

Which regex flags are supported?

g (global), i (case insensitive), m (multiline), s (dotAll), u (unicode), and d (indices) flags are supported.

Yes. The tool shows all capture groups for each match, including named capture groups.

The library includes patterns for email, URL, IP address, phone number, date (YYYY-MM-DD), hex colour, and more.

Test and debug regular expressions in real time. Match highlighting, capture groups, common patterns.

🔒 Your file never leaves your browser. All regex testing runs locally.

//gi

Flags:gims

Test string

Match preview (2 matches)

#	Match	Index	Groups
1	hello@example.com	14	—
2	support@want2convert.com	35	—

1
Enter your pattern
Type your regular expression in the Pattern field. Do not include forward slashes — just the pattern itself.
2
Set flags and test string
Choose flags (g, i, m, s) and paste your test string into the text area.
3
Review matches
Matches are highlighted in the test string. The match list below shows each match with its position and capture groups.