Regex Cheat Sheet - Go

A comprehensive guide to regular expressions with patterns, examples, and explanations

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Basic Metacharacters

.Any character except newline
\Escape character
|Alternation (OR)
^Start of string/line
$End of string/line

Character Classes

[abc]Any of a, b, or c
[^abc]Not a, b, or c
[a-z]Range from a to z
\dDigit [0-9]
\DNon-digit [^0-9]
\wWord character [a-zA-Z0-9_]
\WNon-word character
\sWhitespace
\SNon-whitespace

Quantifiers

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

Groups and Capturing

(pattern)Capturing group
(?:pattern)Non-capturing group
(?P<name>pattern)Named capturing group

Flags

(?i)Case insensitive
(?m)Multiline mode
(?s)Dot matches newline
(?U)Ungreedy (swap meaning of x and x?)

Unicode

\p{L}Unicode letter
\p{N}Unicode number
\p{P}Unicode punctuation
\p{S}Unicode symbol
\p{Latin}Latin script
\P{L}Not Unicode letter

Word Boundaries

\bWord boundary
\BNon-word boundary
\AStart of text
\zEnd of text