there is a huge issue where when a Phone number field is validated on a webform, we get the following error message:
North American Phone numbers should only contain numbers and + and - and ( and ) and spaces and be like 999-999-9999. Please enter a valid ten-digit phone number with optional extension.
In reality we need an ability to customize this and we were looking into the hook_form_alter, but we hit a snag and cannot find ways to modify the error message. How would we be able to modify the validation messages?