regular expression validator to check if string has number

August 24, 2023

I am trying to implement asp.net regularexpression validator and want to check if string contains number or not. Its ok to have string containing number only

I tried below but its not working

<asp:RegularExpressionValidator ID="rfvMyCode" runat="server"  ValidationGroup="ValidationSave" ControlToValidate="txtMyCode"
                ErrorMessage="String must have a Number" ForeColor="#FF3300" ValidationExpression="^[a-zA-Z0-9]+$"></asp:RegularExpressionValidator>

>Solution :

If you want to validate that the string must contain at least one number, you can use .*\d.* regex regex

<asp:RegularExpressionValidator ID="rfvMyCode" runat="server" ValidationGroup="ValidationSave"
    ControlToValidate="txtMyCode" ErrorMessage="String must have a Number" ForeColor="#FF3300"
    ValidationExpression=".*\d.*"></asp:RegularExpressionValidator>

.* means "0 or more of any character"

\d matches any single digit [0-9]