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我用正规表达式校验密码和重复密码遇到问题了，我是用控件校验，现在还没有办法解决！
<asp:Content ID= "Content2 " ContentPlaceHolderID= "MainContent " Runat= "Server ">
<script language= "javascript " type = "text/javascript ">
function isPasswd(sTextId) {
alert(sTextId);
var s =document.all. "+ TextBox2.ClientID +@ ".value;
// s = document.getElementById( "TextBox2 ");

var patrn=/^(\w){6,20}$/;
if (!patrn.exec(s))
{

return false;
}
else
{
return true;
}
}


</script>
<table width= "100% ">
<tr class= "ta ">
<td class= "td " align= "right "> <asp:Label ID= "Label1 " runat= "server " Text= "用户名称： " > </asp:Label> </td>
<td width= "75% " class= "td " > <font color= "red "> <asp:TextBox ID= "TextBox1 " runat= "server " MaxLength= "150 " Width= "160px "> </asp:TextBox> <asp:RequiredFieldValidator ID= "TextBox1Required " runat= "server " ControlToValidate= "TextBox1 "
ErrorMessage= "User Name is required. " ToolTip= "User Name is required. " > *请输入用户名 </asp:RequiredFieldValidator>
</font>
</td> </tr>

<tr class= "tb ">
<td class= "td " align= "right "> <asp:Label ID= "Label2 " runat= "server " Text= "用户密码： "> </asp:Label> </td>
<td class= "td ">
<asp:TextBox ID= "TextBox2 "
runat= "server " MaxLength= "50 " TextMode= "Password " Width= "160px "> </asp:TextBox>
<font color= "red "> [6-20位] </font>
<asp:RequiredFieldValidator ID= "TextBox2Required " runat= "server "
ControlToValidate= "TextBox2 " ErrorMessage= "Password is required. "

ToolTip= "Password is required. " ValidationGroup= "CreateUserWizard ">
<font color= "red "> * </font>
</asp:RequiredFieldValidator>  
<asp:CustomValidator ID= "CustomValidator1 " runat= "server " ClientValidationFunction= "isPasswd( 'TextBox2 ') "
ControlToValidate= "TextBox2 " Display= "Dynamic " ErrorMessage= "密码输入不合法,只能输入6-20个字母、数字、下划线 "> </asp:CustomValidator>
</td> </tr>
<tr class= "ta ">

<td class= "td " align= "right "> <asp:Label ID= "Label3 " runat= "server " Text= "重复密码： "> </asp:Label> </td>
<td class= "td ">
<font color= "red "> <asp:TextBox ID= "TextBox3 "
runat= "server " MaxLength= "50 " TextMode= "Password " Width= "160px "> </asp:TextBox> [6-20位] </font>
<asp:RequiredFieldValidator ID= "TextBox3dRequired " runat= "server " ControlToValidate= "TextBox3 "
ErrorMessage= "Confirm Password is required. " ToolTip= "Confirm Password is required. "
ValidationGroup= "CreateUserWizard "> * </asp:RequiredFieldValidator>  
<asp:CustomValidator ID= "CustomValidator2 " runat= "server " Display= "Dynamic " ErrorMessage= "密码输入不合法,，只能输入6-20个字母、数字、下划线! " ControlToValidate= "TextBox3 " ClientValidationFunction= "isPasswd( 'TextBox3 ') "> </asp:CustomValidator>
<asp:CompareValidator ID= "PasswordCompare " runat= "server " ControlToCompare= "TextBox2 "

ControlToValidate= "TextBox3 " Display= "Dynamic " ErrorMessage= "两次输入不一致! "
ValidationGroup= "CreateUserWizard "> </asp:CompareValidator> </td>
</tr>



<tr class= "tb ">
<td class= "td " align= "right "> <asp:Label ID= "Label5 " runat= "server " Text= "用户类型： " > </asp:Label> </td>
<td width= "75% " class= "td " >
<asp:DropDownList ID= "DropDownList1 " runat= "server ">
</asp:DropDownList>
</td> </tr>


<tr class= "ta ">
<td class= "td " align= "right "> <asp:Label ID= "Label4 " runat= "server " Text= "用户描述： "> </asp:Label> </td>
<td class= "td ">
<asp:TextBox ID= "TextBox4 " runat= "server " TextMode= "MultiLine " Width= "300 " Height= "100 "> </asp:TextBox>

</td>
</tr>



<tr class= "ta ">


<td align= "center " class= "td " style= "height: 23px "> </td>
<td class= "td " align= "left " style= "height: 23px ">
<asp:Button ID= "Button1 " runat= "server " Text= "提交 " Width= "85 " OnClick= "Button1_Click1 " />
<asp:Button ID= "Button2 " runat= "server " Text= "返回 " Width= "85 " />
</td>
</tr>


</table>


</asp:Content>

[解决办法]
没有试过JS加验证控件一起用。
------解决方案--------------------

为什么要用JS，正则表达式直接写在html里不行啊？