That would be the hard way. Just grab tchrist's and Nick Ing-Simmons's greps writtin in Perl.

There is all kinds of hard in the world:

root# ls -l `which perl`
-rwxr-xr-x    3 root     root       733687 Apr 15  2000 /usr/bin/perl
root# ls -l `which grep`
-rwxr-xr-x    1 root     root        75600 Feb  3  2000 /bin/grep

One of them is footprint. I love perl, but it's a big stick to hit grep with. =)

--
$you = new YOU;
honk() if $you->love(perl)

I don't think you realize what it takes to make the Perl regex engine work. You can't just rip it out of Perl. To make it work you'd probably end up just embedding perl into an executable, which would require even more footprint.

Besides, every good system should have Perl so the footprint you should be comparing is grep.pl vs. grep.exe (to borrow a file naming convention from a different platform). I think the pendulum will swing the other way. :)

Update: The two grep's weigh in a 16K and 820 bytes (smaller than grep.exe or much, much smaller).

        - tye (but my friends call me "Tye")