Regular expression notation(正则表达式）

Regular expression notation by Danny Goodman <JavaScript & DHTML Cookbook>

Character Matches Example
\b Word boundary /\bto/ matches "tomorrow"
/to\b/ matches "Soweto"
/\bto\b/ matches "to"
\B Word nonboundary /\Bto/ matches "stool" and "Soweto"
/to\B/ matches "stool" and "tomorrow"
/\Bto\B/ matches "stool"
\d Numeral 0 through 9 /\d\d/ mathces "42"
\D Nonnumeral /\D\D/ mathes "to"
\s Single whitespace /under\sdog/ matches "under dog"
\S Single nowwhitespace /under\Sdog/ matches "under-dog"
\w Letter,numeral,or underscore /1\w/ matches "1A"
\W Not a letter,numeral,or undersore /1\W/ matches "1%"
. Any character except a newline /../ matches "Z3"
[...] any one of the character set in brackets /J[aeiou]y/ matches "Joy"
[^...] Negated characted set /J[^eiou]y/ matches "Jay"
* Zero or more times /\d*/ matches "","5", or"444"
? Zero or one time /\d?/ matches "" or "5"
+ One or more times /\d+/ matches "5" or "444"
{n} Exactly n times /\d{2}/ matches "55"
{n,} n or more times /\d{2,}/ matches "555"
{n,m} at least n, at most m times /\d{2,4}/ matches "5555"
^ at beginning of a string or line /^Sally/ matches "Sally says..."
$ at end of a string or line /Sally.$/ matches "hi,Sally."