split treats its second argument as a string (i.e. a scalar), so you need something like this:
my @differenthtml = split /htmlpagemark/, join('', @lines);
Two additional points (with apologies if they’re unnecessary):
The first element of an array is at index 0, not 1 as suggested by the print statements.
Always — yes, always! — begin your script with:
Hope that helps,
Athanasius <°(((>< contra mundum
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