That looks wrong to me, since therre is no need to constuct the $ra 100 times. Try it this way. Also try it with more patterns or do you search only for two? 
...
my $t4 = new Benchmark;
my $ra = Regexp::Assemble->new();
$ra->add(@strings);
for (1..100) {
        while ( $sequence =~ /$ra/g) { my $val = pos($sequence) - 6; }
        }

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Boris

In reply to Re^2: Multiple Regex's on a Big Sequence - Benchmark by borisz
in thread Multiple Regex's on a Big Sequence by bernanke01

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