How do I test a regular expression?

Paste your pattern and sample text above, choose flags, and review the match list. Adjust the pattern until the matches match your intent.

How do I check if a regex is valid?

If the pattern compiles, the tool reports a valid pattern. Syntax errors from the JavaScript RegExp engine appear as an error message.

A regex pattern is a concise description of text you want to find or validate, built from literals, character classes, quantifiers, and groups.

Paste realistic sample text—logs, API payloads, or form input—then run the pattern against that text so edge cases show up early.

Email fragments, digit sequences, URL path segments, and whitespace cleanup patterns are common starter examples for beginners.

A free online tool that validates regular expressions against sample text for students and developers.

It builds a JavaScript RegExp in your browser, runs it against your text, and lists each match with its index and capture groups.

Enter a pattern, set flags, paste sample text, and optionally load an example chip to practise.

Yes. It is free with no sign-up.

Yes. Mobile browsers are supported.

Free Regex Tester Online, Test Patterns Fast | Binary Tech