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I need to ensure that the input value contains at least one dot, so I have used the following:
<asp:RegularExpressionValidator runat="server"
ControlToValidate="MyInput" Text="*"
ErrorMessage="must contain at least one dot"
ValidationExpression="\.+" />
And that doesn’t work. By inspecting the page source i can see that ASP.NET escapes the backslash character so in java-script it looks like "\\.+". Why does it do so and how do i prevent RegularExpressionValidator from escaping it?
If you want to check if the input contains at least one dot, your expression is incorrect. It matches only input that consist only of dots.
You should use
If escaping proves to be a problem, too, use
[.]instead of\..Note that the RegularExpressionValidator does not validate empty fields. Use the RequiredFieldValidator to do this.