mxcl/homebrew — comment on commit 2a37c8be0d9fb0281b943383913facd7a06766e0
File:  line 0
By mxcl:

Why doesn't this work?

# github tarballs, like v1.2.3
%r[github.com/.*/(zip|tar)ball/v?((\d\.)+\d+)$].match to_s
return $2 if $2

For:

url "https://github.com/sam-github/libnet/tarball/libnet-1.1.4"