RE-greedy or non greedy about '?'

[buran]

greedy:
https://regex101.com/r/QmYBkp/1
from the explanations on the right-hand side:

"yd?" gm
y matches the character y literally (case sensitive)
d? matches the character d literally (case sensitive)
? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)

lazy:
https://regex101.com/r/qvKqqU/1
from the explanations on the right-hand side:

"yd??" gm
y matches the character y literally (case sensitive)
d? matches the character d literally (case sensitive)
? Quantifier — Matches between zero and one times, as few times as possible, expanding as needed (lazy)