That was not at all what I was trying to do.. I screwed that up..
Ok I figured this part out.
RewriteRule ^Doctor/([0-9a-zA-Z]+) showdr.php?mainID=$1 [NC,L]
it takes the url ... showdr.php?mainID=1 and will make it accessible with ...Doctor/1
But what I am trying to do is make it Doctor/firstName lastName (firstName and lastName are the actual db column names.)
Is this possible with mod_rewrite or would that require modifying the php?