http://www.w3schools.com/jsref/jsref_obj_regexp.asp
聲明-------------
modifiers:{i,g,m}
1. var patt=new RegExp(pattern,modifiers);
2. var patt=/pattern/modifiers;
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例子:
var str = "Visit W3Schools";
//兩種方式都可以,但是new時注意特殊字符需要轉義符,需要加“\”
var patt1=new RegExp("\\bW3","g")
// var patt1 = /\bW3/g;
var result = str.match(patt1);
//test函數,返回值布爾型------------------------------
var str = "The best things in life are free";
var patt = new RegExp("e");
var res = patt.test(str);