Reference

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Character Classes

.Any character (except newline)

\wWord char (a-z, A-Z, 0-9, _)

\dDigit (0-9)

\sWhitespace (space, tab, newline)

\WNot a word char

\DNot a digit

\SNot whitespace

\p{L}Any Unicode letter (requires u flag)

\p{N}Any Unicode number (requires u flag)

\p{P}Any Unicode punctuation (requires u flag)

\p{S}Any Unicode symbol (requires u flag)

\p{Z}Any Unicode separator (requires u flag)

\p{M}Any Unicode mark (requires u flag)

\P{L}Not a Unicode letter (requires u flag)

^Start of string/line

$End of string/line

\bWord boundary

\BNon-word boundary

*0 or more

+1 or more

?0 or 1 (Optional)

{3}Exactly 3 times

{3,}3 or more times

{3,6}Between 3 and 6 times

(abc)Capturing group

(?:abc)Non-capturing group

(?<name>abc)Named capturing group

(?=abc)Positive Lookahead: match if followed by

(?!abc)Negative Lookahead: match if NOT followed by

(?<=abc)Positive Lookbehind: match if preceded by

(?<!abc)Negative Lookbehind: match if NOT preceded by

gGlobal match

iIgnore case

mMultiline

sDot All (dot matches newline)