That's it almost. By saying "filter program" I think the OP means the words have to be piped to the filter program. Filters usually take STDIN as input.

Also, from the description of the OP I assume his program will deal with different filters, set by (e.g.) commandline parameters.

So 
my $newword = `sed $word`;

[download]
should become 
my $newword = `echo '$word' | $filterprogram`;

[download]
Where $filterprogram has to be set somewhere else in the script.
$\=~s;s*.*;q^|D9JYJ^^qq^\//\\\///^;ex;print

In reply to Re^2: Running a string through a filter program and recieving the output as a string by Skeeve
in thread Running a string through a filter program and recieving the output as a string by bwgoudey

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