FREE TOOL
Regex tester
Type a pattern and some text. Matches are highlighted as you type.
Highlighted
Result
Matches
WHAT IT DOES
About this tool
Test JavaScript regular expressions with live match highlighting, capture groups, named groups, flags and a replace preview. Common patterns are built in.
Everything runs right in your browser: your text and files are never uploaded or stored.
QUESTIONS
Frequently asked questions
Which regex flavor does this tool use?
JavaScript (ECMAScript) regular expressions, the same engine that runs in browsers and Node.js. Most of the syntax matches PCRE, Python and Java, but lookbehind support and some flags differ.
What do the flags mean?
g finds every match, not just the first; i ignores case; m makes ^ and $ match at line breaks; s lets . match line breaks; u turns on full Unicode; y matches only at the current position.
How do I use groups in the replacement?
Use $1, $2 for numbered groups and $<name> for named groups such as (?<year>\d{4}). $& inserts the whole match.
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