Regex Patterns Cheat Sheet

Essential Regular Expression patterns and syntax for developers

Character Classes

\dAny digit (0-9)

\wAny word character (a-z, A-Z, 0-9, _)

\sAny whitespace (space, tab, newline)

.Any character except newline

[abc]Any character in the set (a, b, or c)

[^abc]Any character NOT in the set

*0 or more occurrences

+1 or more occurrences

?0 or 1 occurrence

{n}Exactly n occurrences

{n,}n or more occurrences

{n,m}Between n and m occurrences

^Start of string/line

$End of string/line

\bWord boundary

\BNon-word boundary

(abc)Capture group

(?:abc)Non-capturing group

(?=abc)Positive lookahead

(?!abc)Negative lookahead

^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$Email Address

^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$URL

^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$Hex Color Code

^\d{4}-\d{2}-\d{2}$Date (YYYY-MM-DD)