The compound word could also be split "on line trading" and in general, there is more than one way to do it. I would create a personal dictionary of atomic words that you want and test against those. You would do this by implementing the grammar

<compound-word> := <word> <compound-word>
<word> := word1 | word2 | ... | wordn
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Regexes can do this for you, for a reasonably small number of atomic words:

my $compound = "onlinetrading";
my $words = 'online|trading';
my ($first, $second);
if ($compound =~ /^($words)($words)$/) {
   $first = $1;
   $second = $2;
}
print "$first, $second\n";
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Alternatively, check out Aspell, as it has some support for compound words.

-Mark

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