⚙️ Regex Tester
Live match highlighting, capture group display, match counter, and a common patterns library. Test regular expressions instantly.
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Match Highlighting
Common Patterns
Code Generation
Enter a regex pattern to generate code...
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Use Tool →Regex Tester FAQ
What regex flags are supported?
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g (global), i (case-insensitive), m (multiline), s (dotAll), and u (unicode). Enter them in the flags field.
Does it show capture groups?
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Yes, when your pattern contains parentheses, matched groups are displayed in a table with their index positions.
What patterns are in the library?
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Common patterns for emails, URLs, phone numbers, IP addresses, dates, hex colors, HTML tags, numbers, credit cards, and more.
Can I use lookahead and lookbehind?
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Yes, JavaScript regex supports positive/negative lookahead (?=...) (?!...) and lookbehind (?<=...) (?<!...).