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var reg = /[123][0-9A-z]/g;
var str = '1asdf3cs';
var arr = str.match(reg);   //["1a","3c"]

 var reg = /(red|bac)[0-9]/g;
 var str = '123red123bac123';
 var arr = str.match(reg);   //["red1","bac1"]
 
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元字符:

每个元字符代表一个位置。元字符可以放在表达式里

\w:匹配所有0-9,A-z _(下划线)的任意字符。 相当于表达式的[0-9A-z_]

\W:^\w(\w的取非).  [^\w]

var reg = /\wabc/g;
var str = '_abcd123abcd';
var arr = str.match(reg);  //["_abc", "3abc"]
\d:配到0-9  [0-9]

\D:对\取非  [^0-9]

var reg = /\dabc/g;
var str = '1abc2abcdef123';
ar arr = str.match(reg);   //["1abc","2abc"]
\s:匹配空白字符

\S:取非

var reg = /\s\w/g;
var str = ' a d c';
var arr = str.match(reg);   //[" a", " d", " c"]
\b:匹配单词边界

\B:匹配非单词边界

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var reg = /\bworld\b/g;  
var str = 'hello world hello';
var arr = str.match(reg);  //["hello"]

 var reg = /\bworld\B/g;
 var str = 'hello world_hello';
 var arr = str.match(reg);  //["hello"]
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转载自www.cnblogs.com/IVF677/p/12037656.html