Regex Tester
Test regular expressions with live highlights.
regex tester, regular expression, pattern matching, regex validator, regex debugger, online regex, regex tool
Do not include slashes; set flags below.
Preview
0 matches found
Hello world
hello WORLD
https://example.com
About Regex Tester
Regular expressions (regex) are powerful pattern-matching tools used by developers worldwide. Our Regex Tester provides an intuitive interface to test, debug, and refine your regular expressions with real-time feedback. Features include support for all major flags (case-insensitive, global, multiline, dotAll), live syntax highlighting of matches in your test text, match count and position indicators, and a built-in library of common regex patterns for emails, URLs, phone numbers, and more. Whether you're parsing log files, validating user input, or extracting data from text, this tool makes regex development faster and less error-prone. All operations run client-side for maximum speed and privacy.
Key Features
- โ100% Free: No signup, no hidden fees, unlimited usage
- โPrivacy First: All processing happens locally in your browser
- โFast & Reliable: Instant results without server delays
- โNo Installation: Works directly in your web browser
- โMobile Friendly: Responsive design works on all devices
Frequently Asked Questions
- How do I test multiple matches?
- Enable the global (g) flag to find all matches in the input.
- What regex flags are supported?
- We support i (case-insensitive), g (global), m (multiline), and s (dotAll) flags.
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