?= is a lookahead assertion. It checks for the match (with any uppercase letter in this case: [A-Z]) but doesn't include it in the match.
?=
[A-Z]
Doesn't seem to have a check for strings with length <= 4.
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?=is a lookahead assertion. It checks for the match (with any uppercase letter in this case:[A-Z]) but doesn't include it in the match.Doesn't seem to have a check for strings with length <= 4.
This comment is hidden because it contains spoiler information about the solution