=>Web API
using System.ComponentModel.DataAnnotations;
[RegularExpression(@"^(Y)|(N)$", ErrorMessage = "IsHandicap can only be Y or N.")]
public string IsHandicap{ get; set; }
=>C Sharp
using System.Text.RegularExpressions;
string regex = @"^(Y)|(N)$";
string inputString = "Y";
Match match = Regex.Match(inputString, regex);
=>Java Script
<script>
function Validate() {
var text = document.getElementById("TextBox1").value;
var pattern = "^(Y)|(N)$";
var result = text.match(pattern);
if (!result)
alert("IsHandicap can only be Y or N.");
}
</script>
<asp:TextBox ID="TextBox1" runat="server" ClientIDMode="Static"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return Validate();" />
Note:- Input string only valid when IsHandicap field value "Y" and "N".
[] - Find any character matching between in the square brackets.
() - Find matching character or word in the brackets.
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