Regex Tester

Live JavaScript Regex Tester

Type a regular expression in the left box, flags in the right, and paste the text you want to match below. The tool highlights every match and shows captured groups in a table. It uses JavaScript's native regex engine, so patterns that work here will work in Node.js and browser code.

Regex Flags

• g — global: find all matches, not just the first.
• i — case-insensitive.
• m — multi-line: ^ and $ match line boundaries.
• s — dot-all: . matches newlines.
• u — Unicode mode.
• y — sticky: matches only from lastIndex.

Common Patterns

Email          /[\w.+-]+@\w+\.\w+/i
URL            /https?:\/\/[^\s]+/i
IPv4           /(?:\d{1,3}\.){3}\d{1,3}/
Phone (US)     /\(?\d{3}\)?[-. ]?\d{3}[-. ]?\d{4}/
Hex color      /#(?:[0-9a-f]{3}){1,2}/i

Regex Cheat Sheet

• \d digit, \D non-digit
• \w word char, \W non-word
• \s whitespace, \S non-whitespace
• . any char (except newline unless s flag)
• ^ start, $ end
• * 0+, + 1+, ? 0 or 1
• {n,m} between n and m times
• (...) capture group, (?:...) non-capturing