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    ÉùÃ÷javascript ÕýÔò±í´ïʽ
   
     var reCat = new RegExp("cat");
      ÄãÒ²¿ÉÒÔ
     var reCat = /cat/;      //Perl ·ç¸ñ   £¨ÍƼö£©
2 ѧϰ×î³£ÓÃµÄ test exec match search  replace  split 6¸ö·½·¨
   1£© test  ¼ì²éÖ¸¶¨µÄ×Ö·û´®ÊÇ·ñ´æÔÚ
       var data = "123123";
       var reCat = /123/gi;
       alert(reCat.test(data));  //true
    
       //¼ì²é×Ö·ûÊÇ·ñ´æÔÚ  g ¼ÌÐøÍùÏÂ×ß  i ²»Çø·Ö´óСд
   2£© exec ·µ»Ø²éѯֵ
       var data = "123123,213,12312,312,3,Cat,cat,dsfsdfs,";
       var reCat = /cat/i;
       alert(reCat.exec(data));  //Cat
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       var data = "123123,213,12312,312,3,Cat,cat,dsfsdfs,";
       var reCat = /cat/gi;
       var arrMactches = data.match(reCat)
       for (var i=0;i < arrMactches.length ; i++)
       {
            alert(arrMactches[i]);   //Cat  cat
       }
     4£© search  ·µ»ØËÑË÷λÖà ÀàËÆÓÚindexof
       var data = "123123,213,12312,312,3,Cat,cat,dsfsdfs,";
       var reCat = /cat/gi;
       alert(data.search(reCat));  //23
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