I am sorry, but that would not work either. The first rule would not catch those sentences that have both S and SF in them. You will have to work in three steps and use an intermediate value. 1. Change SF to Q 2. Change S to VOL 3. Change Q to S Separate your steps by using ruleflow or agenda-groups. Make sure to update your WM after every change. Sorry for the confusion. Regards, Frank FrankVhh wrote > > Hi, > > Sorry, but I fogot about you :-(. > > It does not work because both wolfgang and I did get your question wrong. > > If I were you, I would try to work from the opposite direction and check > whether a String matches S but not SF. Than replace that S by VOL. > > A second rule could than safely check for SF and replace that by S. > > In short, reverse your salience, check that S is not SF and make sure that > you replace the right S in the RHS of your rules. You do not want to > update the WM. > > Regards, > Frank > > > fiitkar wrote >> >> Sorry, it does not work. >> For input SF I allways get VOLVOLFVOL. >> >> Once again: if the input is S the output should be VOL. But if the input >> string contains SF the output should be S and not VOL. >> >> For example: >> SF --> S >> SSF --> VOLS >> SFSF -> SS >> etc. >> > -- View this message in context: http://drools.46999.n3.nabble.com/string-replace-collision-problem-tp3518... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users