检查数字 [英] checking for a digit

问题描述

我要检查在文本框中输入的第一个和最后一个字母是否为数字

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

推荐答案

您应在文本框中使用以下正则表达式文字:

\ d.* \ d

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

\d.*\d

您可以使用正则表达式验证器.

You can use regular expression validator.

<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

" > < >

您可以在此处下载正则表达式生成器以创建任何正则表达式并对其进行测试: [ http://sourceforge.net/projects/regexbuilder/files/]

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

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