JSFiddle - React, Tailwind, and code Playground

JavaScript

var str = "34";

if(!str.match(/^(?![0-9]*$)[a-zA-Z0-9]+$/))
{
	alert(str + "is invalid");
}
else
{
	alert(str + "is valid");
}

var str = "abeer34";

if(!str.match(/^(?![0-9]*$)[a-zA-Z0-9]+$/))
{
	alert(str + "is invalid");
}
else
{
	alert(str + "is valid");
}

var str = "abeer";

if(!str.match(/^(?![0-9]*$)[a-zA-Z0-9]+$/))
{
	alert(str + "is invalid");
}
else
{
	alert(str + "is valid");
}