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
Advertisement

How the Regex Tester Works

  1. Enter your regex pattern and flags
  2. Paste test text
  3. 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.

Advertisement