I think John Hossack wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] > Hi Everyone, > > Does anybody know if it is possible to use the sub-string function within an exists >pattern? >
Sure. (exists) has to have a -pattern- in it, of course -- i.e., something that matches a fact. You can use sub-string on one of the fields in the fact -- i.e., you could write (exists (groceries $? ?item&:(eq (sub-string 1 3 ?item) "egg") $?)) which would match if there was any grocery list that contained an item starting with "egg". --------------------------------------------------------- Ernest Friedman-Hill Distributed Systems Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 Org. 8920, MS 9012 [EMAIL PROTECTED] PO Box 969 http://herzberg.ca.sandia.gov Livermore, CA 94550 -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
