[rules-users] Problem implementing dynamic regular expression

[Wolfgang Laun]

There's no way to alert the Engine to changes of a global.
-W

2011/1/24 Esteban Aliverti <esteban.aliverti at gmail.com>:
> And what about using a global?
> Best Regards
>
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>
> Esteban Aliverti
> - Developer @ http://www.plugtree.com
> - Blog @ http://ilesteban.wordpress.com
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>
> 2011/1/24 Bruno Freudensprung <bruno.freudensprung at temis.com>
>>
>> Thanks for the advice!
>>
>> Bruno.
>>
>>
>> Wolfgang Laun a écrit :
>>
>> If some value is variable, it must be privided in a fact - otherwise
>> the Inference Engine does not register any changes.
>>
>> Notice that you cannot use "matches" in an eval, where plain Java (or
>> mvel) must be used.
>>
>> -W
>>
>> 2011/1/24 Bruno Freudensprung <bruno.freudensprung at temis.com>:
>>
>>
>> Thanks Wolfgang! My sincere apologies for the wrong answer.
>> Does it mean that (probably at the price of a performance penalty) one
>> could
>> handle the variable results of getPropName() over time and write (?):
>>
>> MyEvent(eval (prop1 matches ("This event is for"+getPropName()+" and is
>> sent
>> toblah blah blah")))
>>
>> Best regards,
>>
>> Bruno.
>>
>> Wolfgang Laun a écrit :
>>
>> 2011/1/24 Bruno Freudensprung <bruno.freudensprung at temis.com>
>>
>>
>> MyEvent(prop1 matches eval("This event is for"+getPropName()+" and is sent
>> to
>> blah blah blah"))
>>
>>
>>
>> You cannot use eval() like this. It is a conditional element.
>>
>> If getPropName() is a function that is constant over time (!) then you
>> should be able to
>>
>>    MyEvent(prop1 matches ("This event is for"+getPropName()+" and is..."))
>>
>> If you need to match against a value that should change during
>> execution, put the value into a fact and make sure to update/modify
>> that fact when you change the value:
>>
>>    MyPattern( $v: value )
>>    MyEvent( prop1 matches ("This event is for"+$v +" and is..."))
>>
>> In both cases, the parentheses around the concatenaion are essential.
>>
>> -W
>>
>>
>>
>>
>>
>> Best regards,
>>
>> Bruno.
>>
>>
>> Ayush a écrit :
>>
>> Hi, I'm trying to implement regular expression using matches. The regular
>> expression is dynamic and retrieved from a java function. In my first
>> approach I'm tried to call the java function for matches like
>>
>> MyEvent(prop1 matches "This event is for"+getPropName()+" and is sent to
>> blah blah blah")
>>
>> Now when I try to execute the above expression it gives error as illegal
>> statement (I even tried back-slash to escape it). It also gives error like
>> "Expecting ')' instead of '(' ".
>>
>> So I declared a function which takes two string parameters and returns me
>> the concatenated one.
>> function String concatenate(String str1, String str2) {
>> 	return str1+str2;
>> }
>>
>> $matchStr : String() from concatenate("This event is for",getPropName()+"
>> and is sent to blah blah blah")
>>
>> Now when I'm using this variable in my rule it is not getting executed.
>> Please note that there is no problem in regex because when I put the regex
>> as string (i.e. without using any function to retreive it) it works fine.
>>
>> MyEvent(prop1 matches $matchStr)
>>
>> Can anyone please let me know how can I solve it. Thanks in advance.
>>
>>
>>
>>
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