Page History
| Character | Description |
|---|
\ |
a | Match a BELL, \ |
u0007. |
\ |
A | Match at the beginning of the input. Differs from ^ in that \A will not match after a new line within the input. |
\b, outside of a [Set] |
| Match if the current position is a word boundary. Boundaries occur at the transitions |
between word (\w) and non-word (\W) characters, with combining marks ignored. For better word boundaries, see ICU Boundary Analysis. |
\b, within a [Set] |
Match a BACKSPACE, \u0008. |
\ |
B | Match if the current position is not a word boundary. |
\ |
cX | Match a control-X character. |
\ |
d | Match any character with the Unicode General Category of Nd (Number, Decimal Digit.) |
| . |
\ |
D | Match any character that is not a decimal digit. |
\ |
e | Match an ESCAPE, \u001B. |
\ |
E | Terminates a \Q ... \E quoted sequence. |
\ |
f | Match a FORM FEED, \u000C. |
\ |
G | Match if the current position is at the end of the previous match. |
\ |
n | Match a LINE FEED, \u000A. |
\N{UNICODE CHARACTER NAME} |
| Match the named character. |
\p{UNICODE PROPERTY NAME} |
| Match any character with the specified Unicode Property. |
\P{UNICODE PROPERTY NAME} |
| Match any character not having the specified Unicode Property. |
\ |
Q | Quotes all following characters until \E. |
\ |
r | Match a CARRIAGE RETURN, \u000D. |
\ |
s | Match a white space character. White space is defined as [\t\n\f\r\p{Z}]. |
\ |
S | Match a non-white space character. |
\ |
t | Match a HORIZONTAL TABULATION, \u0009. |
\ |
uhhhh | Match the character with the hex value hhhh. |
\ |
Uhhhhhhhh | Match the character with the hex value hhhhhhhh. Exactly eight hex digits must be provided, even though the largest Unicode code point is \U0010ffff. |
\ |
w | Match a word character. Word characters are [\p{Ll}\p{Lu}\p{Lt}\p{Lo}\p{Nd}]. |
\ |
W | Match a non-word character. |
\x{hhhh} |
| Match the character with hex value |
hhhh. |
\ |
xhh | Match the character with two digit hex value |
hh. |
\ |
X | Match a Grapheme Cluster. Partial implementation for ICU 2.4, does not handle Hangul syllables. |
\ |
Z | Match if the current position is at the end of input, but before the final line terminator, if one exists. |
\ |
z | Match if the current position is at the end of input. |
\ |
0nnn | Match the character with octal value |
nnn. |
\ |
n | Back Reference. Match whatever the nth capturing group matched. n must be > 1 and < total number of capture groups in the |
| pattern. |
[pattern] |
| Match any one character from the set. See UnicodeSet for a full description of what may appear in the |
| pattern. |
. |
| Match any character. |
^ |
| Match at the beginning of a line. |
$ |
| Match at the end of a line. |
\ |
Quotes the following character. Characters that must be quoted to be treated as literals are * ? + [ ( ) { } ^ $ |
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