regex cheat sheet

. 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 word boundary

. * \ escaped special characters

t n r tab, linefeed, carriage return

u00A9 unicode escaped ©

(abc) capture group

1 backreference to group #1

(?:abc) non-capturing group

(?=abc) positive lookahead

(?!abc) negative lookahead

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