Regex Tester
Test regular expressions with live matching and explanations.
2 matches
#1
hello@example.com Groups: hello@example.com#2
support@devutils.fr Groups: support@devutils.frAbout this tool
Regular expressions are powerful but notoriously tricky to get right. This tester gives you live feedback as you type your pattern and test string. See matches highlighted instantly, with explanations of what each part of your regex does.
How to use the Regex Tester
- Enter your regular expression pattern
- Type or paste your test text
- Watch matches highlight in real time as you type
- Review match details (index, groups, matches count)
Features
- Live regex matching as you type
- Match highlighting in test text
- Match count and group extraction
- Flags support (g, i, m, s, u)
- No server, fully client-side
Frequently asked questions
Is this regex tester free?
Yes. Test regular expressions online for free without any signup or limitations.
Does it explain my regex?
Yes. The tool highlights matches and provides explanations of what each part of your pattern does.
Which regex flags are supported?
The tester supports global (g), ignoreCase (i), multiline (m), dotAll (s), and unicode (u) flags.
Can I test JavaScript regex here?
Yes. The tool uses the browser's native RegExp engine, so it matches JavaScript regex behavior exactly.