.net中正则表达式的客户端验证--javascript

.net中客户端验证可以用微软自带的验证控件，但明显没有直接写的Javascript来得简单有效，请参照以下三步：
第一：Form如下：

<form id="Form1" method="post" runat="server">
            <FONT face="宋体"></FONT><FONT face="宋体"></FONT>
            <br>
            1. Name :<br>
            <asp:TextBox ID="txtName" runat="server" /><br>
            2. Email :<br>
            <asp:TextBox ID="txtEmail" runat="server" /><br>
            3. Web URL :<br>
            <asp:TextBox ID="txtWebURL" runat="server" /><br>
            4. Zip :<br>
            <asp:TextBox ID="txtZIP" runat="server" /><br>
            5.Content<br>
            <asp:TextBox ID="txtContent" runat="server" TextMode="MultiLine" Width="504px" Height="80px" />
            <br>
            <asp:Button ID="btnSubmit" OnClientClick=" return validate()" runat="server" Text="Submit" />
        </form>

第二：调用函数如下（可自行扩展）

<script language="javascript" type="text/javascript">
                function validate()
                        ...{
                            if (document.getElementById("<%=txtName.ClientID%>").value=="")
                            ...{
                                        alert("Name Feild can not be blank");
                                        document.getElementById("<%=txtName.ClientID%>").focus();
                                        return false;
                            }
                            if(document.getElementById("<%=txtEmail.ClientID %>").value=="")
                            ...{
                                        alert("Email id can not be blank");
                                        document.getElementById("<%=txtEmail.ClientID %>").focus();
                                        return false;
                            }
                            // var emailPat = /^(".*"|[A-Za-z]w*)@([d{1,3}(.d{1,3}){3}]|[A-Za-z]w*(.[A-Za-z]w*)+)$/;
                            //var emailPat = "w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*";
                            //var emailPat    =    /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;
                            //var emailPat    =    '^([w]+@([w]+.)+[a-zA-Z]{2,9}(s*;s*[w]+@([w]+.)+[a-zA-Z]{2,9})*)$';
                            var emailPat    =    "^[a-zA-Z0-9_.]+@[a-zA-Z0-9-]+[.a-zA-Z]+$";
                            var emailid=document.getElementById("<%=txtEmail.ClientID %>").value;
                            var matchArray = emailid.match(emailPat);
                            if (matchArray == null)
                            ...{
                                    alert("Your email address seems incorrect. Please try again.");
                                    document.getElementById("<%=txtEmail.ClientID %>").focus();
                                    return false;
                            }
                            if(document.getElementById("<%=txtWebURL.ClientID %>").value=="")
                            ...{
                                    alert("Web URL can not be blank");
                                    document.getElementById("<%=txtWebURL.ClientID %>").value="http://"
                                    document.getElementById("<%=txtWebURL.ClientID %>").focus();
                                    return false;
                            }
                            var Url="^[A-Za-z]+://[A-Za-z0-9-_]+\.[A-Za-z0-9-_%&?/.=]+$"
                            var tempURL=document.getElementById("<%=txtWebURL.ClientID%>").value;
                            var matchURL=tempURL.match(Url);
                            if(matchURL==null)
                            ...{
                                    alert("Web URL does not look valid");
                                    document.getElementById("<%=txtWebURL.ClientID %>").focus();
                                    return false;
                            }
                            if (document.getElementById("<%=txtZIP.ClientID%>").value=="")
                            ...{
                                    alert("Zip Code is not valid");
                                    document.getElementById("<%=txtZIP.ClientID%>").focus();
                                    return false;
                            }
                            var digits="0123456789";
                            var temp;
                            for (var i=0;i<document.getElementById("<%=txtZIP.ClientID %>").value.length;i++)
                            ...{
                                    temp=document.getElementById("<%=txtZIP.ClientID%>").value.substring(i,i+1);
                                    if (digits.indexOf(temp)==-1)
                                    ...{
                                                alert("Please enter correct zip code");
                                                document.getElementById("<%=txtZIP.ClientID%>").focus();
                                                return false;
                                    }
                            }
                            var ContentLength="";
                            if (document.getElementById("<%=txtContent.ClientID%>").value=="")
                            ...{
                                    alert("Content is need!");
                                    document.getElementById("<%=txtContent.ClientID%>").focus();
                                    return false;
                            }
                            else if(document.getElementById("<%=txtContent.ClientID%>").value.length>100)
                            ...{
                                alert("Content is Too Long,and More than 100 Chars!");
                                    document.getElementById("<%=txtContent.ClientID%>").focus();
                                    return false;
                            }
                            return true;
                        }
        </script>

第三：Page_Load事件中加入一行：

private void Page_Load(object sender, System.EventArgs e)
        ...{
             btnSubmit.Attributes.Add("onclick", "return validate()");
        }