The form tells you early

Steps

1. 1 Guest Open the host application 0:01 ▣
2. 2 Guest Type a 7-digit phone and tab away 0:03 ▣

   The note's exact failure. The rule accepts E.164 and North American formats and normalises on save — a strict local pattern would lock out a real international applicant.

3. 3 Guest Fix it 0:04 ▣

   Feedback is on blur and submit, never every keystroke — telling someone their email is wrong at the third character is hostile.

4. 4 Guest A malformed email gets the same treatment 0:06 ▣

   One definition per field type, shared by every form — two copies of a rule is how 'valid here, rejected there' happens.

5. 5 Guest Try to submit anyway — the server refuses the same values 0:08 ▣

   The browser is a courtesy layer; the server is the authority. A client that does not run the regex changes nothing — the same rule refuses the same value twice.

6. 6 Guest Empty the form and ask to submit 0:10 ▣

   Every required field is empty. The page flags them, counts them, and names them — and the colour it flags them in is the whole of the note.