正则表达式实例(JS验证)

    //密码是英数字且不能为空
    function checkPass1(val)
    {
        var pattChar=new RegExp('[0-9a-zA-Z]{1,}');
        if(val=='')
        {
            document.getElementById('lblInfo').innerHTML='密码不能为空';
        }
        else if(pattChar.exec(val)==val)
        {
            document.getElementById('lblInfo').innerHTML='密码正确';
        }
        else
        {
            document.getElementById('lblInfo').innerHTML='密码只能是英数字';
        }
    }
    
    //根据输入文本判断密码强度，密码只能是英数字，且长度必须大于6
    //强度标准：
    //弱-全是数字
    //强-当长度大于8，且包括英文字符
    //中-其它
    function checkPass2(val)
    {
        var i;
        var c;
        var iCharCount=0;
        var iNumCount=0;
        var iOtherCount=0;
        var pattChar=new RegExp('[a-zA-Z]');
        var pattNum=new RegExp('[0-9]');
        
        for(i=0;i<val.length;i++)
        {
            c=val.substr(i,1);
            if(pattChar.exec(c)!=null)
            {
                //找到字符
                iCharCount++;
            }
            else if(pattNum.exec(c)!=null)
            {
                //找到数字
                iNumCount++;
            }
            else
            {
                //其它字符
                iOtherCount++;
            }
        }
        
        if(iOtherCount>0)
        {
            document.getElementById('lblInfo').innerHTML='密码只能是英数字';
        }
        else
        {
            if((iCharCount+iNumCount)<6)
            {
                document.getElementById('lblInfo').innerHTML='密码长度至少六位';
            }
            else if(iCharCount==0)
            {
                document.getElementById('lblInfo').innerHTML='密码强度-弱';
            }
            else if(iCharCount>0 && (iCharCount+iNumCount)>8)
            {
                document.getElementById('lblInfo').innerHTML='密码强度-强';
            }
            else
            {
                document.getElementById('lblInfo').innerHTML='密码强度-中';
            }
        }
        
    }
    //移除字符串首尾空格
    function deleteBlank(control)
    {
        var text=control.value;
        text=text.replace(/^\s{1,}/g,''); 
        text=text.replace(/\s{1,}$/g,'');  
        control.value=text; 
    }


//调用方法
<asp:TextBox ID="txtPassWord" onblur="checkPass2(this.value);" runat="server"></asp:TextBox>