Developer Tools
Regex Tester
Test and debug regular expressions with live matches, groups, and index positions.
Hello World
Match 1 at 0
HelloMatch 2 at 6
WorldQuick reference
Email: [\\w.-]+@[\\w.-]+URL: https?:\\/\\/\\S+Phone: \\+?[0-9 -]{7,}Date: \\d{4}-\\d{2}-\\d{2}About the regex tester
Write a regular expression, paste a test string, and see every match highlighted in real time. Includes a cheat sheet for character classes, anchors, and quantifiers - useful while you're learning regex or debugging an existing pattern.
Frequently asked questions
Which regex flavor is this?
JavaScript / ECMAScript. Most patterns work in Python and Java too, but lookbehind support and named groups can differ - test in your target language too.
What do the g, i, m flags do?
g matches every occurrence (not just the first); i is case-insensitive; m makes ^ and $ match per-line instead of per-string.