Regular expression for maximum digits excluding comma - asp.net

Question

I have the below regular expression:
ValidationExpression="[0-9]+(,[0-9]+)*"
It allows numbers in the format: 12,2345 or 231,23454
Now I want to include a condition that will on the whole allow only 7 digits max excluding
comma.
The below is the modified code
The below is in the item template
I also have a radio button in item template
<asp:TextBox runat="server" ID="tbText" CssClass="someclass" MaxLength="11"
%>'></asp:TextBox>
<asp:RegularExpressionValidator ValidationExpression="[0-9]+(,[0-9]+)*" ID="ValComp" runat="server" CssClass="asdf"
ControlToValidate="tbMileage" Text="*" Enabled="false" Display="Dynamic"/>
<asp:CustomValidator ID="cvalMileage" runat="server" CssClass="adsf" Text="*" Display="Dynamic">
</asp:CustomValidator>
<asp:CustomValidator ID="CustomValidator1" ClientValidationFunction="functionName"
runat="server" CssClass="asd" Text="*" Display="Dynamic">
</asp:CustomValidator>
Since I want to validate the radio button checked corresponding textbox in repeater the below is the code I have written
var selText = $(".Class1 input[type=radio]:checked").closest(".Class1").find(".subClassText input[type=text]").val();
alert('Hi');
if (selText.replace(",", "").length <= 7) {
args.IsValid = true;
}
else {
args.IsValid = false;
}
The alert fires twice and based on args is False i have a popup that is firing twice
Thanks.

Answer 1

Regular expressions are not good at this problem, but if you limit your input to a maximum of one comma this expression will fit:
([0-9]{0,0}[,]?[0-9]{0,7})|([0-9]{0,1}[,]?[0-9]{0,6})|([0-9]{0,2}[,]?[0-9]{0,5})|([0-9]{0,3}[,]?[0-9]{0,4})|([0-9]{0,4}[,]?[0-9]{0,3})|([0-9]{0,5}[,]?[0-9]{0,2})|([0-9]{0,6}[,]?[0-9]{0,1})|([0-9]{0,7}[,]?[0-9]{0,0})
You will recognize that this problem is not well suited for regular expression as this expression is fixed to your maximum of 7.

Answer 2

You could use a CustomValidator control with client-side validation like this:
ASPX code:
<asp:CustomValidator id="CustomValidator1" runat="server"
ControlToValidate="YourControlNameHere"
ClientValidationFunction="ClientValidation"
OnServerValidate="ServerValidation"
ErrorMessage="Invalid number." />
JavaScript (uses jQuery):
function ClientValidation(source, arguments)
{
var inputText = arguments.Value;
var expression = /^[0-9]+(,[0-9]+)*$/;
if (expression.test(inputText) && inputText.replace(",", "").length <= 7) {
arguments.IsValid = true;
}
else {
arguments.IsValid = false;
}
}
C# code behind:
public void ServerValidation(object source, ServerValidateEventArgs args)
{
string inputText = args.Value;
Regex regex = new Regex(#"^\d+(,\d+)*$");
if (regex.IsMatch(inputText) && inputText.Replace(",", "").Length <= 7)
{
args.IsValid = true;
}
else
{
args.IsValid = false;
}
}