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Asked: 2026-05-21T12:16:18+00:00

Hello friends In my application I want to customize regular expression in such a

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Hello friends
In my application I want to customize regular expression in such a way that it will allow character and dot only. For eg. I could be be able to enter M.C.A or MCA any of these. For this task how to customize regular expression? I tried [a-zA-Z] followed by\ and dot in side bracket but is not working.
I also tried [ABCD] just for testing but it shows invalid text for ABC.
What might be the reason????
Thanks to all…

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1 Answer

  1. Editorial Team

    You will need to escape the dot as in regex it normally means ‘any character’

    [a-zA-Z\.]+

    in c# you will need to deinfe the regex string as follows:

    var r = @"[a-zA-Z\.]+";

    Edit based on comment:

    <asp:TextBox ID="qualificationBox" runat="server" Width="250px"></asp:TextBox>
<asp:RegularExpressionValidator ID="NameRequiredValidator" runat="server" 
 ErrorMessage="Please Enter Name" ControlToValidate="qualificationBox" 
 ValidationExpression="[a-zA-Z\.]+"></asp:RegularExpressionValidator>
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