js正则表达式的10个应用实例

<script>  
   var str = 'sassdfdfffdasdffffffsdsdddsss';  
   var arr = str.split('');//先把字符串分割为字符串数组  
   str = arr.sort().join('');对数组进行排序后再将数组转化为字符串  
    var value = '';  
    var index = 0;  
    var re = /(\w)\1+/g;  
    str.replace(re,function($0,$1){  
       if(index<$0.length){  
          index = $0.length;  
          value = $1;  
       }  
    });  
    alert('最多的字符：'+ value +' ,重复的次数：'+index);//最多的字符：f ,重复的次数：10  
</script>

<script>  
    var str = ' hel  lo '  
    function trim(){  
        var re = /^\s+|\s+|\s+$/g;  
        return str.replace(re,'');  
    }  
    alert('('+trim(str)+')');//(hello)  
</script>

function isEmail(str){  
       var reg =/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;  
       return reg.test(str);  
   }

function isEmail(str){  
       var reg =/^1([0-9]){10}$/; //也可以为 <span style="background-color:rgb(255,255,255);">var reg= <span style="color:rgb(0,0,0);font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:14px;text-align:left;white-space:pre;">/^1\d{10}$/;</span></span>  
       return reg.test(str);  
   }

function isEmail(str){  
       var reg =/^([0-9a-zA-Z])+$/;  
       return reg.test(str);  
   }

var str ='dgfhfgh254bhku289fgdhdy67';  
    var arr = [];  
    function arrFn(){  
        var re = /\d+/g ;  
        arr.push(str.match(re));  
        return arr;  
    }

var re = /([a-zA-Z])\1+/;

var re = /[aeiou]$/i;  //不要忘了添加不区分大小写的字符i

var str ='$1,023,032.03';  
     var re = /^\$\d{1,3}((,\d{3}))*(\.\d{2})?$/;  //需要注意的是特殊字符要加转义符号\

//    获取 url 参数  
    function getUrlParam(sUrl, sKey) {  
        var arr={};  
        sUrl.replace(/\??(\w+)=(\w+)&?/g,function(match,p1,p2){  
            //console.log(match,p1,p2);  
            if(!arr[p1]){  
                arr[p1]=p2;  
            }  
            else {  
                var p=arr[p1];  
                arr[p1]=[].concat(p,p2);  
            }  
  
        })  
        if(!sKey)return arr;  
        else{  
            for(var ele in arr){  
                if(ele==sKey){return arr[ele];}  
            }  
            return "";  
        }  
    }