checking for a digit

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ASP.NET

I want to check whether the first and the last letters entered in a textbox are digits or not

Posted 22-Nov-10 16:58pm

MathewPV

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Ed Guzman · Answer 1 · 2010-11-22T17:10:00

Solution 1

You should use the following regular expression against the text box text:

\d.*\d

Posted 22-Nov-10 17:10pm

Ed Guzman

Comments

MathewPV 22-Nov-10 23:26pm

its working thanks

virang_21 · Answer 2 · 2010-11-22T17:19:00

Solution 2

You can use regular expression validator.

XML

<asp:TextBox ID="txtStringFirstLast" runat="server"></asp:TextBox>
               
               
                <asp:RegularExpressionValidator ID="RegularExpressionValidator3" runat="server"
                    ControlToValidate="txtStringFirstLast" ErrorMessage="first and last letter must be digit."
                    ValidationExpression="^\d\w*\d$" ></asp:RegularExpressionValidator>

You can download regular expression builder here to create any regular expression and test it: [http://sourceforge.net/projects/regexbuilder/files/]

Posted 22-Nov-10 17:19pm

virang_21

Comments

MathewPV 22-Nov-10 23:26pm

its working good thanks.

MathewPV 22-Nov-10 23:28pm

it should allow only "-" in between digits this process is iterative ie.
1-1
12-1-12
12-12-12-12
any number of digits with hyphen in between

virang_21 22-Nov-10 23:35pm

Yes my solution will work for anything like digit followed by any word followed by digit. It cannot handle spaces in between. If you want spaces use the regex in answer 1. I gave a link to regex builder so try your regex on it and see if it meet your need.

virang_21 23-Nov-10 0:34am

Change Regular expression to ^\d(\d*[-]\d*)*\d*$