Lazy RegEx like `??` . I don't get it

Question

After reading this lesson I wondered
https://www.sololearn.com/learn/9773/?ref=app

If metacharacter `?` is already matching {0, 1} in greedy mode, how will `??` be more lazy than that, by matching {0} ?

I was also thinking the same for `{x,}?` but then I thought at least this could act similarly to the `*?` we saw there

Answer 1

Take a look at this output of the code written in python.
You will understand better the difference between greedy and lazy.
https://code.sololearn.com/c11peV18VNNe/?ref=app

Answer 2

☋g¥☰n☾♄☯Թ♄☰ᒪ

That is a great example between lazy and greedy patterns 👍

Answer 3

Thank you

Answer 4

☋g¥☰n☾♄☯Թ♄☰ᒪ thanks, I understood the example given in the lesson.

But still I don't see any difference between greedy `?` and lazy `??`, to me they seems to match the same amout, both 0 or 1 , indistinctly

Answer 5

Mmm... Sadly googling for "lazy regex ?? examples" doesn't match nothing more than simple "add another ? to the quantifier ? to make into non-greedy"

I found this website to test it
https://regex101.com/r/QZZ0qP/1

And by adding/removing a `? ` I only see the match highlights changing from 27 matches to 35 matches

EDIT:
By opening the list of matches (menu icon top right) it shows more "empty" match, even between the 0 or 1 letter [ab] . 🤔💭

Paradoxically, I get more results in lazy mode🤔😅