html - Validation regular expression

Question

Must be an integer between 10 to 100 inclusively.

<asp:TextBox ID="Donation" Columns="20" MaxLength="3"  runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" 
runat="server"ControlToValidate="Donation"   
ErrorMessage="Please enter valid donation" ValidationExpression="*">

This is question1 ,i dont know how to write the validation expression.

question from:https://stackoverflow.com/questions/65894807/validation-regular-expression

Answer 1

Regular Expressions is a wonderful tool. You can use the following links to learn how it can provide your solution. After making an attempt and posting it here, you'll likely find more assistance is forthcoming.

1. https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expressions
2. https://regex101.com/