Regex Tester
Test and debug regular expressions with real-time matching. Supports flags and capture groups.
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Regex Tester lets you write and test regular expressions instantly with real-time feedback. See exactly which parts of your text match, view capture groups, and experiment with different flags—no need to run code or compile.
How it works
- 1Enter your regular expression pattern in the input field
- 2Paste or type the text you want to test against
- 3Enable flags like global, case-insensitive, or multiline
- 4View matches highlighted in your text with capture groups
Who uses this tool
- ✓Developers validating email addresses and URLs before processing
- ✓Data analysts extracting specific patterns from large text files
- ✓Students learning regex syntax and pattern matching concepts
- ✓QA testers writing test cases and validation rules
- ✓Content editors finding and replacing text with complex patterns
Frequently Asked Questions
How do I use the Regex Tester?
Enter your regular expression in the pattern field, paste test text below it, and all matches are highlighted in real time.
Is the Regex Tester free?
Yes, the Regex Tester on ToolPix is 100% free with no signup or installation required.
Is my data safe?
All processing happens in your browser, your data never leaves your device.
Which regex flags are supported?
All standard JavaScript regex flags: g (global), i (case-insensitive), m (multiline), s (dotAll), and u (unicode).
Are capture groups shown?
Yes — each match is highlighted in the text and capture groups are listed separately with their matched values.
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