Regex Pattern
Test String
Matches
Why use our Online Regex Tester?
Our free regex tester lets you validate, debug, and highlight regular expressions instantly. Use it to test your regular expressions and fix errors with live feedback and detailed error messages. It's a great regex highlight tool for quick regex validation online.
Frequently Asked Questions (FAQ)
What is a regular expression (regex)?
A regular expression is a sequence of characters that specifies a search pattern in text. It's commonly used for string searching and manipulation, like finding specific words, validating input formats (like emails or phone numbers), or replacing text.
How does this online regex tester work?
This tool uses JavaScript's built-in RegExp engine to evaluate the pattern you provide against the test string. It highlights all matches found in real-time and displays any syntax errors if your regex pattern is invalid.
Is this regex debugger free to use?
Yes, this online regex tester and debugger is completely free to use. There are no limits on usage.