[arch-general] pacman version string regex?

Hi, is there a regular expression describing the version comparison algorithm in pacman/lib/libalpm/package.c::alpm_pkg_vercmp()? I have a pacman wrapper (bash script) that needs to determine the package name to give to pacman given a directory name, because it is possible to give globs to filenames, but not to pacman. I cannot use "pacman -[QS]s <string>", because sometimes I want to glob just package names, not descriptions. So basically I don't want the actual version comparison, only the removal of the version suffix including our release number. clemens