#!/usr/bin/perl -w
# usage : ./this_script.pl input_file > captured_benchmarks
use strict;
use Benchmark;
my @data = do {
   open(my $fh, '<', $0) or die;
   <$fh>
};
timethese (1000000,
    { grep_and => sub{
    my @res1 = grep /GGGGGACACCTTCTCTCTCT/ && /RH_MEa0001bG06/,@data;
    },
    double_grep => sub{
    my @res2 = grep /GGGGGACACCTTCTCTCTCT/,grep /RH_MEa0001bG06/,@data;
    },
    lookahead_grep => sub{
    my @res3 = grep /^(?=.*GGGGGACACCTTCTCTCTCT)(?=.*RH_MEa0001bG06)/,@data;
    }
}
);