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I am familiar with greedy and lazy quantifiers, but I was surprised to learn from this answer that there is a lazy equivalent for "exact number of matches":

+-------------------+-----------------+------------------------------+
| Greedy quantifier | Lazy quantifier |        Description           |
+-------------------+-----------------+------------------------------+
| {n}               | {n}?            | Quantifier: exactly n        |
+-------------------+-----------------+------------------------------+

How could {n} and {n}? be different? I looked up the description in Microsoft's documentation and in their example for {n}? (which is different from their example for {n}), they explain:

[previous group]{2}?  Match the pattern in the first group two times,
                      but as few times as possible.

From my studies in mathematics, the smallest value of two that I am aware of is two. Am I missing something?

Théophile
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