Standard Meta Characters
Escape Characters
A backslashed character matches a special character or a character class (more than one character). Here's a list of special characters:
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\n Linefeed \r Carriage return \t Tab \v Vertical tab \f Form-feed \d A digit (same as [0-9]) \D A non-digit (same as [^0-9]) \w A word (alphanumeric) character (same as [a-zA-Z_0-9]) \W A non-word character (same as [^a-zA-Z_0-9]) \s A whitespace character (same as [ \t\v\n\r\f]) \S A non-whitespace character (same as [^ \t\v\n\r\f]) |
\###, where ### is a backslashed two- or three-digit octal number such as \033, matches the character with the specified value, unless it can be interpreted as a backreference. Priority is given to backreferences in this case.