That looks to be a fixed-width representation. That is better handled using unpack instead.

my ($memAddr, $data, $ascii) = unpack( "A10A20A*", $line );
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I guessed at the 10 and 20, but those are the column widths. The * means "and everything else".

Then, you will want to massage in some fashion the various bits. So, something like $data =~ s/\s//g; to remove the whitespaces. Etc.