Regex Tester

Test and debug regular expressions free in your browser. No sign-up — your text never leaves your device.

Test Regular Expressions Live

Live Regular Expression Tester lets you write a regex pattern, apply flags, and test it against sample text with matches highlighted in real time — far faster than testing a pattern by running your actual code repeatedly.

How to use

Enter your regular expression pattern and any flags (like g or i).
Paste sample text to test the pattern against.
Review the highlighted matches and capture groups.

Common use cases

Building and debugging a validation pattern for a form field.
Testing a pattern for extracting data from log lines.
Learning regex syntax by experimenting with live feedback.

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