# 1. unify domains
sub("^http://prdownloads\.sourceforge\.net/", "http://downloads.sourceforge.net/", url)
sub("^http://download\.sf\.net/", "http://downloads.sourceforge.net/", url)
# 1. unify domains
sub("^http://prdownloads\.sourceforge\.net/", "http://downloads.sourceforge.net/", url)
sub("^http://download\.sf\.net/", "http://downloads.sourceforge.net/", url)