JSFiddle - React, Tailwind, and code Playground

by Tintu Raju

HTML

<input type='text' id='myid'>
<input type='button' id='validate' onclick='validate();' value='validate'>

JavaScript

function validate(){
    
    v = document.getElementById("myid").value;
    var reg = /^\d+-\d+$/;
    if(!reg.test(v))
       alert('wrong format it should be like this 3-5'); 
    else
        alert('right format');
    
}