Regex Summary

Metacharacters

^

Start of string (or line if multiline option used)

$

End of string (or line)

.

Any character (except \n – or all characters if single line option used)

|

Alternation

{n,m}

Match specific number of occurrences

[…]

Match one character from list

(….)

Create a group

*

0 or more of previous pattern

+

1 or more of previous pattern

?

0 or 1 of previous pattern, also converts greedy expressions to lazy

\

Changes following meta character to literal character

\<1-99>

Back reference to a group in the pattern, numbered 1-99

Character Classes

[aeiou]

Match any single character between brackets

[^aeiou]

Match any single character not in list between brackets

[0-9]

Matches any character within range. To match a hyphen, place it at beginning or end of the character set

\w

Match any word characters [a-zA-Z0-9_]. For .NET, also matches Unicode

\W

Match any non-word characters, i.e. [^a-zA-Z0-9_]

\s

Matches any whitespace [\f\n\r\t\v ]

\S

Matches any non-whitespace [^\f\n\r\t\v ]

\d

Matches any digit [0-9]

\D

Matches any non-digit [^0-9]

Character Escapes

\t

Matches tab character

\r

Matches carriage return

\v

Matches vertical tab

\f

Matches form feed

\n

Matches new line

\e

Matches escape character

Unicode

\u9999

Matches Unicode code point, must be exactly 4 digits after \u

\p{L}

Matches any Unicode “letter”

\P{L}

Matches any non-letter Unicode category

\p{Z}

Matches any whitespace or invisible separator character

\P{Z}

Matches any non-whitespace Unicode character

\p{N}

Matches any Unicode number 

\P{N}

Matches any non-number Unicode character

\p{P}

Matches any punctuation character

\P{P}

Matches any non-punctuation Unicode character

\p{C}

Matches control characters and unused code points

\P{C}

Matches non-control characters in Unicode

\p{S}

Matches any symbol character

\P{S}

Matches any non-symbol character in Unicode

Named Unicode blocks

\p{block}

Found character in named block

IsBasicLatin

IsGreek

IsHebrew

IsArabic

IsCurrencySymbols

IsMathematicalOperators

See Unicode Character Blocks for more named blocks in .NET

\P{block}

Does not match named block