Function: get_token Purpose: this routine performs the meat of the work for the mini language lexical analyzer. It will identify and return the next token in its string input. It uses a series of regular expressions to identify various tokens. Input: s: A string from which the token is taken Output: A struct describing a token or an error struct $LastChangedBy: lphilpott $ $LastChangedDate: 2011-03-14 14:11:19 -0700 (Mon, 14 Mar 2011) $ $LastChangedRevision: 8388 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/mini/get_token.pro $