Test and debug regular expressions with real-time matching.
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Enter a pattern to start matching
Why use our Regex Tester?
Test and debug regular expressions in real-time. See matches highlighted instantly as you type. Perfect for learning regex, validating patterns, or debugging complex expressions. Supports all JavaScript regex flags and shows capture groups.
Frequently Asked Questions
What regex syntax is supported?
This tool uses JavaScript's regular expression engine, which supports most common regex features including lookahead, lookbehind, and Unicode.
What do the flags mean?
g=global (find all), i=case insensitive, m=multiline (^ and $ match line boundaries), s=dotall (. matches newlines).
How do I match special characters?
Escape special characters with a backslash. For example, \. matches a literal dot, \$ matches a dollar sign.
What are capture groups?
Parentheses () create capture groups that extract parts of a match. Access them with $1, $2, etc. in replacements.
Is my data secure?
Yes! All regex processing happens entirely in your browser. Your test data is never sent to any server.