If you're ever likely to want to pull out different ones from the list, you might like to take advantage of the fact that, in array context, a pattern match returns a list of everything that was captured. So

my $s = 'sbs/c/b/cow.bld:three.bld';
my @a = $s =~ /(\w+\.bld)/g;
print $a[$#a];
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... will print out the one you want, but also leave you with an array with all the others in it as well.

§ George Sherston