正则 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>正则</title>
</head>
<body>
    <input type="text" id="regexp">
    <script>
        var $ = function(id){
        return document.getElementById(id);
        }
        var addEvent = function(obj,event,fn){
            if(obj.addEventListener){
                obj.addEventListener(event,fn,false);
            }else if(obj.attachEvent){
                obj.attachEvent("on"+event,fn);
            }
        }
        var regexp = $("regexp");
        //test方法
        /*var regexp = $("regexp");
        addEvent(regexp,'change',function(){
            //var pt1 = /^\d+$/g;
            var pt1 = new RegExp('^\\d+$');
            if(pt1.test(regexp.value)){
                console.log(1);
            }else{
                console.log(0);
            }
        })*/
        //replace方法
        /*addEvent(regexp,'keyup',function(){
            var pt2 = /\s/;
            regexp.value = regexp.value.replace(pt2,'0');
        })*/
        //分支写法
        /*addEvent(regexp,'change',function(){
            var pt3 = /^([1-9]\d*(\.\d{2})?|0(\.\d{1,2})?)$/g;
            if(pt3.test(regexp.value)){
                console.log(1);
            }else{
                console.log(0);
            }
        })*/
        //零宽断言
        /*addEvent(regexp,'change',function(){
            var pt4 = /\b\w+(?=ing\b)/g;//零宽度正预测先行断言
            var pt5 = /(?<=\bre)\w+\b/g;//零宽度正回顾后发断言,js不支持
            regexp.value = regexp.value.replace(pt5,'ccc');
        })*/

    </script>
</body>
</html>

 

posted @ 2014-11-04 15:27  decsev  阅读(132)  评论(0)    收藏  举报