常用正则

[geqianqian-shihan]

去掉空格

    str = str.replace(/\s*/g,"");    // 去除字符串内所有的空格
    str = str.replace(/^\s*|\s*$/g,"");    // 去除字符串内两头的空格
    str = str.replace(/^\s*/,"");    // 去除字符串内左侧的空格
    str = str.replace(/(\s*$)/g,"");    // 去除字符串内右侧的空格　

[geqianqian-shihan]

校验带IP

var reg = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\:([0-9]|[1-9]\d{1,3}|[1-5]\d{4}|6[0-5]{2}[0-3][0-5])$/;

var reg1 = /^((2[0-4][0-9])|(25[0-5])|(1[0-9]{0,2})|([1-9][0-9])|([1-9]))\.(((2[0-4][0-9])|(25[0-5])|(1[0-9]{0,2})|([1-9][0-9])|([0-9]))\.){2}((2[0-4][0-9])|(25[0-5])|(1[0-9]{0,2})|([1-9][0-9])|([1-9]))$/