JSFiddle - React, Tailwind, and code Playground

by Rajeesh Menoth

HTML

<asp:TextBox id="txtInput" runat="server" />
<asp:Button id="btnSubmit" runat="server" Text=
"Submit" onclientclick="return validateString();"/>

JavaScript

function validateString()
{
 var regex = /^[a-zA-Z ]*$/;
 if(regex.test((document.getElementById("txtInput").value)))
   {
      alert("input string is correct");
   }
   else
   {
      alert("Only string is allowed here");
      return false;
   }
}