If your substitutions are working fine (no word-boundary issues), but just taking a long time (understandable, iterating through two arrays for substitutions on each file line), perhaps the following will be helpful:

my $TestText;

{
    local $/;
    open( my $in, '<', "Test.txt" ) or die "cannot open Test.txt $!";
    $TestText = <$in>;
    close $in;
}

$TestText =~ s/\Q$_\E/$hash{$_}/g for keys %hash;

open( my $out, '>', "TestFinal.txt" ) or die "cannot create TestFinal 
+$!";
print $out $TestText;
close $out;

[download]

This reads the entire file into a scalar, so substitutions are done on the entire file's contents. This also uses a hash's key/value pairs instead of different array element pairs, so you'll need to initialize the hash (%hash) accordingly for the three substitution pairs.

Hope this helps!

Edit: my $TestText ... to $TestText ... in the file slurp block and quotemeta \Q$_\E.

In reply to Re: Replace many array element with another corresponding array element in a file by Kenosis
in thread Replace many array element with another corresponding array element in a file by faezshingeri

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