Test Regular Expressions in Real-Time
Regular Expressions (Regex) are incredibly powerful for searching, validating, and manipulating text. Our Regex Tester allows you to write patterns and see matches update instantly, highlighting results as you type.
Visual Match Highlighting
We use a custom highlighting engine to show you exactly what your pattern is matching. This is invaluable when debugging complex patterns like email validators or password strength checkers.
Common Patterns Quick-Reference
\d- Any digit (0-9).\w- Any word character (Alphanumeric + underscore)..- Any character (except newline).*- 0 or more occurrences.+- 1 or more occurrences.?- 0 or 1 occurrence.
Regex FAQ
Which Regex flavor is this?
This tool uses the JavaScript flavor of Regex, which is standard for web development (Node.js/Chrome/Firefox).
How do I make it case-insensitive?
Use the i flag. In JavaScript: /pattern/i.
How do I match a specific email?
A simple pattern is `\S+@\S+\.\S+`. For stricter validation, more complex patterns are needed.