Validate email in zendesk Help Center ticket forms.

email_validate.js

$('input').keyup(function(e){
  var re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
  if(e.target.name === 'request[anonymous_requester_email]'){
    var match = re.test(e.target.value);
    console.log(match);
  };
});