What is a regular expression (RegExp)?

Test and debug regular expressions interactively online. Perfect for developers and QA engineers who need instant regex validation and pattern testing.

Test your Regular Expression

Enter your regular expression and the text to see the matches.

Regular Expression

Test Text

Text with Matches

Type some text to test...

Matches (0)

Enter a regular expression and a test string to begin.

💡 Tips:

• The test runs automatically as you type.
• Use flags `g` (global), `i` (case-insensitive), and `m` (multiline) to modify the search behavior.
• Matches will be highlighted in yellow in the test text.
• If your regular expression is invalid, an error message will be shown.

Frequently Asked Questions

Common questions about RegExp Tester & Debugger

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