<select id="example" style="width: 200px">
  <option></option>
  <option >Joe blogs (joe.blogs@gmail.com) </option>
  <option >AUserWithAVeryLongName AUserWithAVeryLongName (a.user.with.a.very.long.name@gmail.com)</option>
</select>

$('#example').select2({
   placeholder: 'Select'
});

AUserWithAVeryLongName AUserWithAVeryLongName (a.user.with.a.very.long.name@gmail.com)