The output of "net use" is generally bad to parse. If your Windos is new enough (XP Pro) to include WMIC, the output of
WMIC NETUSE LIST FULL /FORMAT:CSV
should contain all that you need, and is much easier to parse. Only problem would be share names with commas in them, but for a reason unbeknownst to me, these are much rarer than those with embedded spaces :-)
There are several such command line utilities whose output is inconsistent or not parseable without mind reading capabilities. In such cases one should look for alternative sources of input.