RegExp (Metacharacters)

Metacharacters are characters with a special meaning:

.

Find a single character, except newline or line terminator

\w

Find a word character

\W

Find a non-word character

\d

Find a digit

\D

Find a non-digit character

\s

Find a whitespace character

\S

Find a non-whitespace character

\b

Find a match at the beginning/end of a word, beginning like this: \bHI, end like this: HI\b

\B

Find a match, but not at the beginning/end of a word

\0

Find a NULL character

\n

Find a new line character

\f

Find a form feed character

\r

Find a carriage return character

\t

Find a tab character

\v

Find a vertical tab character

\xxx

Find the character specified by an octal number xxx

\xdd

Find the character specified by a hexadecimal number dd

\udddd

Find the Unicode character specified by a hexadecimal number dddd