Parse an RPM name into its components

Is there a name-parsing tool that is part of the official RPM tool package?

I have a list of filenames. Each is the filename of an RPM package. I don't have the actual packages, just the filenames. For each I need to extract the package name and version ($NAME and $VERSION). The reason I need this is I am writing a script that then makes sure that "yum install $VERSION" installs $VERSION. This is part of a system that builds packages and verifies they are properly uploaded.

The list of filenames looks like:

$ cat /tmp/packages.txt
/home/builder/packages/testing-dev/CentOS/6/x86_64/emacs-mercurial-2.8-3.el6.x86_64.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/emacs-mercurial-el-2.8-3.el6.x86_64.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/mercurial-2.8-3.el6.x86_64.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/mercurial-hgk-2.8-3.el6.x86_64.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/python-redis-2.8.0-2.el6.noarch.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/redis-2.6.16-1.el6.1.x86_64.rpm
/home/builder/packages/testing-dev/CentOS/6/x86_64/sei_dnsmaster-1.0-99.el6.x86_64.rpm

I found the following code which is a BASH function that does the task:

function parse_rpm() { RPM=$1;B=${RPM##*/};B=${B%.rpm};A=${B##*.};B=${B%.*};R=${B##*-};B=${B%-*};V=${B##*-};B=${B%-*};N=$B;echo "$N $V $R $A"; }

for i in $(</tmp/packages.txt) ; do
    parse_rpm $i
done

It works. Mostly. There are some exceptions:

$ parse_rpm CentOS/6/x86_64/sei_dnsmaster-1.0-99.el6.x86_64.rpm
sei_dnsmaster 1.0 99.el6 x86_64

Notice that it didn't get the version correctly (it should be 1.0-99)

I'm wondering (1) if there is a tool in the rpmdev package that does this correctly. (2) If not, is there an official regex I could use. (3) What is the python equivalent of that regex?

Thanks in advance!