A first thought that comes into my mind would be to construct a hash of arrays (HoA) to get rid of those 26 arrays that you have (and what if the filename doesn't start with a letter at all?)
here is some code:
$hash{$_} = [] for ('A'..'Z'); # prepare some empty arrayrefs
$file_name =~ /^(.)/; # Mmm... It would be better to use a substr here
+ :/
push @{$hash{uc($1)}}, $infoline; # push an $infoline, first by upper
+casing the key
I am no Perl guru, so others will probably point to a better direction.
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