Regex Tester Online
Use our free Regex Tester to test regular expressions against your text instantly. See matches, groups, and errors in real time.
Supported: g i m s u y
Matches
Index: 12
test@tooltar.com
Group 1: test
Group 2: tooltar.com
Index: 33
foo@bar.com
Group 1: foo
Group 2: bar.com
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How the Regex Tester Works
- Enter your regex pattern and flags
- Paste test text
- View matches instantly
Features
- Match preview
- Flags support
- Error handling
- Fast and accurate
Use Cases
- Validation
- Parsing
- Search & replace prep
- Log analysis
FAQs
Is this Regex Tester free?
Yes. It is free and works online.
Which flags are supported?
Standard JavaScript flags like g, i, m, s, u are supported.
Does it run on my device?
Yes. Testing happens in your browser.
What if my regex is invalid?
The tool shows a clear error message.
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