正则校验

匹配IP
function isIP1(strIP) {  
    if (strIP == ""){return false};  
    var strRegex= /^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[09][0-9]|[1-9][0-9]|[0-9]|\*)$/ //匹配IP地址的正则表达式
    if(strRegex.test(strIP)){return true;}
        return false;  
}

//返回val的字节长度(中文算两个字节) 
function getByteLen(val) {
    var len = 0;
    for ( var i = 0; i < val.length; i++) {
        if (val[i].match(/[^\x00-\xff]/ig) != null) //全角
            len += 2;
        else
            len += 1;
    }
    return len;
}

验证URL
var strRegex = "^((https|http)://)?[a-z0-9A-Z]{3}\.[a-z0-9A-Z][a-z0-9A-Z]{0,61}?[a-z0-9A-Z]\.com|net|cn|cc (:s[0-9]{1-4})?/$";
 var re = new RegExp(strRegex);
re.test(str)