Regex Builder & Tester
Build, test, and debug regular expressions with real-time feedback
Common Patterns
Click to use common regex patterns
Regex Pattern
Enter your regular expression pattern and set flags
Test String
Enter text to test your regex against
Sample Data
Load sample text for testing
Regex Reference
Character Classes
.- Any character\d- Digit [0-9]\w- Word character\s- Whitespace[abc]- Character set[^abc]- Negated set
Quantifiers
*- 0 or more+- 1 or more?- 0 or 1{n}- Exactly n{n,m}- Between n and m{n,}- n or more
Anchors
^- Start of string$- End of string\b- Word boundary\B- Non-word boundary
Groups
(abc)- Capture group(?:abc)- Non-capture(?=abc)- Lookahead(?!abc)- Negative lookaheada|b- Alternation
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