Character codes for ECMA based languages

\f matches form-feed.
\r matches carriage return.
\n matches linefeed.
\t matches horizontal tab.
\v matches vertical tab.
\0 matches NUL character.
[\b] matches backspace.
\s matches whitespace (short for [\f\n\r\t\v\u00A0\u2028\u2029]).
\S matches anything but a whitespace (short for [^\f\n\r\t\v\u00A0\u2028\u2029]).
\w matches any alphanumerical character (word characters) including underscore (short for [a-zA-Z0-9_]).
\W matches any non-word characters (short for [^a-zA-Z0-9_]).
\d matches any digit (short for [0-9]).
\D matches any non-digit (short for [^0-9]).
\b matches a word boundary (the position between a word and a space).
\B matches a non-word boundary (short for [^\b]).
\cX matches a control character. E.g: \cm matches control-M.
\xhh matches the character with two characters of hexadecimal code hh.
\uhhhh matches the Unicode character with four characters of hexadecimal code hhhh.