JSFiddle - React, Tailwind, and code Playground

by Felipe Zura

HTML

<input type="text" name="email" id="email">

JavaScript

function validaEmail(email){ 
	var re  = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/; 
	if (!re.test(email)) { alert ("Dirección de correo inválida"); return false; } return true; 
} 

$("#email").on('blur',function(){validaEmail($(this).val());});