Regex Tester (Test Regular Expressions Online)
Test and debug regular expressions with live matching, groups, and real-time results. Free online regex tester for developers.
Free online tool. No signup required. All processing runs in your browser.
About this tool
This regex tester lets you write and test regular expressions in real time. It highlights matches, shows captured groups, and helps you debug patterns quickly. Ideal for form validation, data extraction, and text processing.
What is Regex Tester (Test Regular Expressions Online)?
A regular expression (regex) is a pattern used to match and manipulate text. Developers use regex for validation, searching, parsing, and replacing text in applications.
How to use Regex Tester (Test Regular Expressions Online)
- Enter your regular expression pattern.
- Paste or type the test text.
- View matches and captured groups instantly.
- Adjust your regex until it works as expected.
Examples
Example input
Pattern: \d+ Text: Order 123, item 456
Example output
Matches: 123, 456
FAQ
What is regex used for?
Regex is used for pattern matching, validation (emails, passwords), parsing, and text replacement.
Does this support flags like i or g?
Yes, you can test patterns with common regex flags depending on implementation.
Why is my regex not matching?
Check escaping, flags, and pattern syntax carefully. Small mistakes can break matches.