https://www.radiohunno.com/core/schreikasten/libs/universal.js

1//General functions for a lot of plugins
2//Returns true if the email is well formed
3function check_email( cadena ) {
4	var answer=false;
5	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/;
6	if (filter.test(cadena)) {
7		answer=true;
8	}
9	return answer;
10}
11
12//Returns true if there is an email is in the text	
13function email_intext ( cadena ) {
14	var answer=false;
15	var emailsArray = cadena.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);
16	if (emailsArray)
17		answer=true;
18	return answer;
19}