RegexLab — Regex Tester & Multi-Case Runner

Pattern

/ /

Test String

Highlighted Matches

Test String

Replace With

Result

Test your pattern against multiple inputs. Set each to "should match" or "should not match" to build a test suite.

Common Patterns

Quick Reference

.Any character \dDigit [0-9] \wWord char [a-zA-Z0-9_] \sWhitespace \bWord boundary ^Start of string $End of string *0 or more +1 or more ?0 or 1 (optional) {n,m}n to m times [abc]Character class [^abc]Negated class (abc)Capture group (?:abc)Non-capture group a|bAlternation (?=x)Lookahead (?!x)Negative lookahead (?<=x)Lookbehind (?<name>)Named group