Verbs of "delighting" or "regretting"

Question 1

to have regret doing something

Answer 1

avoir regret de faire qc

Question 2

to regret doing something

Answer 2

regretter de faire qc

Question 3

to be delighted at doing something

Answer 3

se réjouir de faire qc

Question 4

to regret having done something

Answer 4

se repentir d’avoir faire qc