Regex Tester
This free Regex Tester tool helps you clean, format, and transform text directly in your browser.
Test regular expressions directly in your browser. Enter a regex pattern, optional flags, and sample text to see matches instantly.
Input Text
Paste sample text to test
Results
Matched values
How it works
This regex tester builds a JavaScript regular expression from your pattern and flags, then runs it against the input text to show matches.
It is useful for testing validation patterns, extracting values, debugging text processing logic, and checking whether a regex behaves as expected before using it in code.
Common use cases
- Test email or phone number patterns
- Extract IDs, tokens, or numeric values
- Check JavaScript regex behavior quickly
- Debug matching rules before coding
- Validate text parsing logic in the browser
Frequently asked questions
What does this regex tester do?
It lets you test regex patterns against sample text and view matches directly in your browser.
Can I use regex flags like g, i, and m?
Yes. You can enter common JavaScript regex flags such as g, i, and m.
Does this tool validate invalid regex patterns?
Yes. Invalid patterns show an error message instead of running the test.
Related tools
FAQ
Common questions about this tool.
What does the Regex Tester tool do?
It helps you clean or transform text using the regex tester function.
Is the Regex Tester tool free to use?
Yes. You can use it online for free.
How to use
Use Regex Tester in three simple steps.
- Paste or enter your input. Add the text or data you want to process.
- Run the tool. Click the main action button to generate the result.
- Copy or reuse the output. Review the result and use it in your workflow.
Use cases
Common situations where this tool can help.
- Use Regex Tester to speed up repetitive browser-based editing or formatting work.
- Handle quick cleanup tasks without installing extra software.
- Prepare content or data before copying it into your next workflow step.
Example
A quick example of how this tool works.
Input
Pattern: \\d+\nText: Order 123 shipped on 2026-03-07
Output
Matches: 123, 2026, 03, 07