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Regex Tester
Enter a JavaScript-compatible regular expression pattern.
Flags
Paste or type the text you want to test against the regular expression.
Highlighted preview
Matched text is highlighted so you can immediately see what the regex extracts.
Regex result
No matches
0
Active flags: gi
| # | Match | Position | Groups |
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How it works
Test regular expressions online with live matches, flags, groups and detailed match positions.
Practical examples
FAQ
What is a regex tester?
A regex tester lets you test regular expressions against sample text and inspect matches, groups and positions in real time.
Which regex engine does this tool use?
This tool uses the JavaScript RegExp engine built into your browser. Some advanced features may behave differently compared with PCRE, Python or .NET regex engines.
What do regex flags mean?
Flags modify how the regular expression works. For example, thei flag enables case-insensitive matching, whileg enables global matching.
Does this regex tester support named groups?
Yes. Named capture groups supported by JavaScript regular expressions are displayed in the match details section.
Does this tool send my text anywhere?
No. Regex matching runs locally in your browser. Text and patterns are not sent to an external server.
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