备忘：js正则表达式中的元字符

Predefined term	Matches
\t	Horizontal tab
\b	Backspace
\v	Vertical tab
\f	Form feed
\r	Carriage return
\n	Newline
\cA : \cZ	Control characters
\x0000 : \xFFFF	Unicode hexadecimal
\x00 : \xFF	ASCII hexadecimal
.	Any character, except for newline (\n)
\d	Any decimal digit; equivalent to [0-9]
\D	Any character but a decimal digit; equivalent to [^0-9]
\w	Any alphanumeric character including underscore; equivalent to [A-Za-z0-9_]
\W	Any character but alphanumeric and underscore characters; equivalent to [^A-Za-z0-9_]
\s	Any whitespace character (space, tab, form feed, and so on)
\S	Any character but a whitespace character
\b	A word boundary
\B	Not a word boundary (inside a word)

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