validateEmail.js

validateEmail : function(component, event, helper) {
		    var id = event.getSource().getLocalId();
        var emailInp = component.find(id);
        var value = emailInp.get("v.value");
        
        var patt = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
		    var res = patt.test(value);
        
		    var saveBtn = component.find("saveBtn");

        // Is input an email?
		    if (value != "" && res == false) {
            // Set error
            emailInp.set("v.errors", [{message:"Invalid Email Address"}]);
            saveBtn.set("v.disabled", true);
        } else {
            // Clear error
            emailInp.set("v.errors", null);
            saveBtn.set("v.disabled", false);
        }
    },