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my $pat = join '|', keys(%hashstore); $doc =~ s!\b($pat)\b!$1/$hashstore{uc($1)}!ig;
my %hashstore = ( "DEXX" => "AREX", "AREX" => "CUBE" ); ... print("$doc1\n"); # DEXX/AREX/CUBE print("$doc2\n"); # DEXX/AREX print("$doc3\n"); # DEXX/AREX