Regex - Cheatsheet

Character classes
.    any character except newline
\w \d \s    word, digit, whitespace
\W \D \S    not word, digit, whitespace
[abc]    any of a, b, or c
[^abc]    not a, b, or c
[a-g]    character between a & g

^abc$    start / end of the string
\b \B    word, not-word boundary

Escaped characters
\. \* \\    escaped special characters
\t \n \r    tab, linefeed, carriage return

Groups & Lookaround
(abc)    capture group
\1    backreference to group #1
(?:abc)    non-capturing group
(?=abc)    positive lookahead
(?!abc)    negative lookahead

Quantifiers & Alternation
a* a+ a?    0 or more, 1 or more, 0 or 1
a{5} a{2,}    exactly five, two or more
a{1,3}    between one & three
a+? a{2,}?    match as few as possible
ab|cd    match ab or cd


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