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£¨1£©var recat = new RegExp("cat"); //¼òµ¥¶¨Òå¡£
var recat = new RegExp("cat","gi");//g->global,i->case insensitive.
var recat = /cat/gi; //perlģʽ
£¨2£©var sToMatch = "cat";
var reCat = /cat/;
alert(reCat.test(sToMatch)); //true
var sToMatch = "a bat, a cat, a Fat Cat, a faT caT";
var reAt = /at/;
var arrMatches = reAt.exec(sToMatch); //Ö»·µ»ØµÚÒ»¸öat³öÏÖµÄʵÀý£¬bat. ×¢ÒâÕâÀïʹÓÃexecʱ£¬²ÎÊýÊÇÔ×Ö·û´®
var sToMatch = "a bat, a cat, a Fat Cat, a faT caT";
var reAt = /at/gi;
var arrMatches = sToMatch.match(reAt); //ÕâÀïʹÓÃmatchʱºò£¬²ÎÊýÊÇÕýÔò±í´ïʽ
var sToMatch = "a bat, a cat, a Fat Cat, a faT caT";
var reAt = /at/gi;
alert(sToMatch.search(reAt)); //ÕâÀïºÍindexOf()ÓÐЩÏàËÆ £¬Êä³ö3
£¨3£©var sToChange = "The sky is blue. ";
alert(sToChange.replace("blue","gray")); //output "The sky is gray. "
var sToChange = "The sky is blue. ";
var reRed = /red/;
var sResultText = sToChange.replace(reRed,function(sMatch){ //ÕâÀïreplace()µÄµÚ¶þ¸ö²ÎÊýÊÇÒ»¸öÄäÃûº¯Êý£¬¸Ã
return "blue"; &
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var Sys = {};
var ua = navigator.userAgent.toLowerCase();
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