Regex Quick Reference

\w

word character

\W

non-word character

\d

digit

\D

non-digit

\s

whitespace

\S

non-whitespace

\r

carriage return

\n

line feed

\t

tab

[\b]

backspace

\x00^[1]

character by hex value

?

zero or one

{n^[2]}

n times

*

zero or more

{n^[3],}

n or more times

+

one or more

{n^[4], m}

n to m times

[ abc ]

a,b, or c

[^ abc ]

not a,b, or c

[a-c]

a, c, or anything in between

a|c

either a or c

\b

word boundary

\B

not word boundary

\<

start of word

\>

end of word

^

start of line

$

end of line

(?=pat^[5])

positive look-ahead

(?!pat)

negative look-ahead

(?<=pat)

positive look-behind

(?<!pat)

negative look-behind

(pat)

group with back-reference

(?<name>pat)

group with named back-reference

\n^[6]

refer to a back-referenced group

(?:pat)

group without back-reference

(?i:pat)

case insensitive

(?-i:pat)

case sensitive

(?s:pat)

dot matches newline

(?-s:pat)

dot does not match newline

(?x:pat)

ignore pattern spacing