Regex Tester
Test regular expressions online with real-time matching. Enter a regex pattern and test string to see matches highlighted instantly. Supports common regex syntax including groups, quantifiers, and flags. Useful for debugging patterns, validating input formats, and learning regex. Works entirely in your browser.
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How to Use Regex Tester
- Enter your regex pattern in the pattern field.
- Enter test text in the text area.
- View matches highlighted in real time.
Why Use Regex Tester
Regular expressions are powerful but easy to get wrong. Testing a pattern against sample text before using it in code saves debugging time. This tool highlights matches in real-time, showing exactly what your regex captures — useful for validating email formats, phone numbers, URLs, and any text pattern.
Frequently Asked Questions
How do I test a regex pattern?
Enter your regular expression in the pattern field and your test string in the test field. Matches are highlighted in real time.
What regex syntax is supported?
The tool supports common regex syntax including character classes, quantifiers, groups, anchors, and lookaheads.
Can I see capture groups?
Yes. The tool shows captured groups for each match, making it easy to debug complex patterns.
Is my data uploaded?
No. All regex testing happens locally in your browser. Your patterns and test strings are never uploaded.
Can I test multiple patterns?
Yes. You can change the pattern or test string at any time to test different combinations.