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<html>
<head>
<title> js正则表达式 </title>
<script type="text/javascript">
var msg='自己想13873457446自己想13873457446自己想13873457446自己想13873457446自己想13873457446';
//1.创建正则表达式.
//提取所有匹配的字符串,g表示全局模式.能提取所有的匹配.而默认是
//非全局变量.
var regobj=/d{7}{4}/g;
<!-- var result=regobj.exec(msg);
alert(result);
var result1=regobj.exec(msg);
alert(result1);
var result2=regobj.exec(msg);
alert(result2);
var result3=regobj.exec(msg);
alert(result3); -->
//循环提取.
// if(null)等价于if(false);while也一样.
var result;
do{
result=regobj.exec(msg);
alert(result);
}while(result);//这句很重要,当result等于null时,while中的条件就变成false.跳出循环.
</script>
</head>
<body>
</body>
</html>