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function chksite(obj){
if(obj.value!=""){
obj.value=obj.value.toLowerCase();
var reg = /^(http:\/\/)?([wW]{3}\.)?$/;
obj.value = obj.value.replace(reg,"");}
}
var regweb=/(https?\:\/\/)?(w{3}\.)?[\w-]{3,}\.[a-z]{2,4}(\.[a-z]{2})?$/;
var re=/^https?:\/\/([wW]{3}\.)?/;
var str='https://WWW.google.com';
var str1=str.replace(re,"");
alert(str1)
<script type="text/javascript">
var data = ["google.com", "http://google.com", "http://www.google.com", "http://www.google.com.hk"];
var reg = /^http:\/\/(www)?/ig;
for(var i=0;i<data.length;i++)
{
document.write("源字符串:" + data[i] + " 替换结果:" + data[i].replace(reg, "") + "<br />");
}
</script>
function chksite(str){
var val = str.toLowerCase().replace(/^\s+|\s+$/g,'');
return val===""?false:val.replace(/^https?:\/\/(www.)?/,"");
}
alert(chksite('http://google.com'))
alert(chksite('http://www.google.com'))
alert(chksite('https://www.google.com'))