Regex Tester Online
Write regex patterns and see matches highlighted in real time with support for flags and capture groups.
Your files are processed locally in your browser. Nothing is uploaded or stored.
Features
Key features of Regex Tester
Test regular expressions against sample text with live matching.
Highlight all matches in the input text as you type.
Support global, case-insensitive, and multiline flags.
Show match groups and capture group details.
Run regex evaluation entirely in the browser.
Benefits
Why use this tool
Debug regex patterns interactively without writing test scripts.
See match results instantly as you edit the pattern.
Keep test data private by running everything locally.
Use cases
Common ways to use Regex Tester
Build and test validation patterns for forms.
Debug log-parsing regex before deploying to production.
Learn regex syntax with real-time visual feedback.
Process
How to use Regex Tester
Enter a regular expression pattern.
Paste sample text to test against.
View highlighted matches and capture groups.
Related tools
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Related guides
Guides for this tool
How to Test Regular Expressions Online
Learn how to test and debug regular expressions with live match highlighting using a free browser-based tool. Support for flags and capture groups.
FAQ
Frequently Asked Questions
Is my test text sent to a server?
No. Regex evaluation happens locally in your browser.
Which regex flags are supported?
Global, case-insensitive, and multiline flags are available.
Is this tool free to use?
Yes. MultiTool Panda tools are free and do not require sign-up.
Does this tool work on mobile?
Yes. The interface is responsive and works in modern mobile browsers.
Do I need to install software?
No. The tool runs directly in your browser.