app.js

...

function findEmailAddresses(text) {
  var emails = text.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);
  return emails;
}

var emails      = {
  ...
  parse: {
    handler: function(request) {
      var payload = request.payload;
      var emails  = findEmailAddresses(payload.text);

      emails.forEach(function(email) {
        db.sadd("emails", email); 
      });

      request.reply({
        success: true
      });
    }
  }
};

server.route({
  method    : 'POST',
  path      : '/emails/parse',
  config    : emails.parse
});