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Regex Tester

Test and debug regular expressions with live matching results

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Regular Expression Pattern

/ /

g (global) i (case insensitive) m (multiline) s (dotAll) u (unicode) y (sticky)

Test String

Replace

Replace With

Replace Output

Regular Expression Quick Reference

Character Classes

. - Any character
\d - Any digit (0-9)
\w - Word character
\s - Whitespace
\D - Not a digit
\W - Not a word char
\S - Not whitespace

Quantifiers

* - 0 or more
+ - 1 or more
? - 0 or 1
{n} - Exactly n times
{n,} - n or more
{n,m} - Between n and m

Anchors

^ - Start of string
$ - End of string
\b - Word boundary
\B - Not word boundary

Groups

(abc) - Capture group
(?:abc) - Non-capturing
a|b - OR operator

Character Sets

[abc] - Any of a, b, or c
[^abc] - Not a, b, or c
[a-z] - Range a to z

Lookaround

(?=abc) - Positive lookahead
(?!abc) - Negative lookahead
(?<=abc) - Positive lookbehind
(? - Negative lookbehind



        
        
            
                
                    
                        
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