Character classes

In the following table, you can find the patterns for character classes, which tell the Regex to match a single character:

Pattern	Description	Example
.	This matches any character, except newline or another unicode line terminator, such as (\n, \r, \u2028 or \u2029).	/f.o/ matches "fao", "feo", and "foo"
\w	This matches any alphanumeric character, including the underscore. It is equivalent to [a-zA-Z0-9_].	/\w/ matches "f" in "foo"
\W	This matches any single nonword character. It is equivalent to [^a-zA-Z0-9_].	/\W/ matches "%"in "100%"
\d	This matches any single digit. It is equivalent to [0-9].	/\d/ matches "1" in "100"
\D	This matches any non digit. It is equivalent to [^0-9].	/\D/ matches "R" in "R2-D2"
\s	This matches any single space character. It is equivalent to [ \t\r\n\v\f].	/\s/ matches " " in "foo bar"
\S	This matches any single nonspace character. It is equivalent to [^ \t\r\n\v\f].	/\S/ matches "foo" in "foo bar"

Literals

In the following table, you can find the patterns for literal characters, which tell the Regex to match a special character:

Pattern	Description	Example
Alphanumeric	These match themselves literally.	/javascript book/ matches "javascript book" in "javascript book"
\0	This matches a NUL character.
\n	This matches a newline character.
\f	This matches a form feed character.
\r	This matches a carriage return character.
\t	This matches a tab character.
\v	This matches a vertical tab character.
[\b]	This matches a backspace character.
\xxx	This matches the ASCII character, expressed by the xxx octal number.	/112/ matches the "J" character
\xdd	This matches the ASCII character, expressed by the dd hex number.	/x4A/ matches the "J" character
\uxxxx	This matches the ASCII character, expressed by the xxxx UNICODE.	/u0237/ matches the "J" character
\	This indicates whether the next character is special and is not to be interpreted literally.	/\^/ matches "^" in "char ^"