|
. |
matches any character except newline |
|
\ |
escape character |
|
\w |
word character [a-zA-Z_0-9] |
|
\W |
non-word character [^a-zA-Z_0-9] |
|
\d |
Digit [0-9] |
|
\D |
non-digit [^0-9] |
|
\n |
new line |
|
\r |
carriage return |
|
\t |
tabulation |
|
\s |
white space |
|
\S |
non-white space |
|
^ |
beginning of a line |
|
$ |
end of a line |
|
\A |
beginning of the string (multi-line match) |
|
\Z |
end of the string (multi-line match) |
|
\b |
word boundary, boundary between \w and \W |
|
\B |
not a word boundary |
|
\< |
beginning of a word |
|
\> |
end of a word |
|
{n} |
matches exaclty n times |
|
{n,} |
matches a minimum of n times |
|
{x,y} |
matches a min of x and max of y |
|
(a|b) |
‘a’ or ‘b’ |
|
* |
matches 0 or more times |
|
+ |
matches 1 or more times |
|
? |
matches 1 or 0 times |
|
*? |
matches 0 or more times, but as few as possible |
|
+? |
matches 1 or more times, but as few as possible |
|
?? |
matches 0 or 1 time |
