At this time, there is no such feature. May I ask you please to open a JIRA feature request for it? The way I see it, we would need to create a feature to allow binding of variables to arbitrary expressions in the LHS and allow this binds to be used in the RHS.
[]s Edson 2007/9/22, Godmar Back <[EMAIL PROTECTED]>: > > On 9/22/07, Edson Tirelli <[EMAIL PROTECTED]> wrote: > > > > Sorry, nope. Is there a use case for that? > > > > For instance, I'd like to write a rule where I need to be alerted of > all facts where a specific field is of the form "(.*)Suffix". The > action I'm then taking requires the "(.*)" as a parameter. > The value of "Suffix" does not matter to the action and should be > restricted to the .drl file (as it matters there only.) > > If I cannot capture the match, I will have to pay both a cost in > runtime and in expressiveness. In runtime because the regular > expression match is repeated in the action. > In expressiveness, because my code is now less localized since there > will be 2 places that deal with "Suffix". If I repeated "Suffix" in > the match and action as a string literal, changing it would require > changing it in two places: > > when n : Name (value matches "(.*)Suffix") > then TakeAction(n, "Suffix") > > I do not know if I could use a variable, as in > > final String suffix = "Suffix"; > when n : Name (value matches ("(.*)" + suffix)) > then TakeAction(n, suffix) > > but even then, the code is less expressive and the match would need to > repeated; in any event, I'd like to be able to write something along > the lines of: > > when n : Name (value matches "(.*)Suffix") .... some way to bind > "presuffix" to $1 .... > then TakeAction(presuffix) > > where "presuffix" captures $1 in the match. This way, I'd have to > change "Suffix" only once. > > - Godmar > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com
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