[rules-users] Contains substring in the LHS with regular expression capturing groups?

[Waruzjan Shahbazian]

Hi,

Thanks for the reply. I wanted to be sure that there wasn't any more 
efficient way to check a substring in a string, or do you think that 
eval() with a indexOf() call would be more efficient than matches() with 
regular expression?. Since I can't group the results, the speed is the 
only issue here.

In my application I am creating the PackageDescr myself with some 
"template" RuleDescr's (which are being filled in with the, limited, 
user input in the Swing GUI) and the package is being build with the 
builder. If the regular expression methode in the matches operator is 
the best way to check a substring in a string, I can use variabeles 
(which are the user inputs) to fill the regular expression. So I don't 
really need a new operator for this. But I am interessted how the 
development of a new operator would be, so maybe you could tell me where 
I need to be to do so :-) .

In the attachment  is the classe diagram of the PackageDescr with the 
linked classes as I have understood and used in my application. Of 
course not every operation and attribute is included, but maybe this 
could be helpfull for someone else who wants to create PackageDescr's 
directly.

I suppose the public methodes used in this operation are going to be 
supported by the following drools versions? Or should I have used the 
DRL and XML ? =-O

Thanks,

Waruzjan

Edson Tirelli schreef:
>    Yes, you may use matches. The other alternative is using an eval and a
> regular indexOf() call to check for the existance of the substring. Drools
> up to versions 4.0.x is JSE 1.4 compliant, so you can't use contains()
> method.  In trunk, you may also develop your own operator and plug it into
> the engine... although, it is not documented yet, but if you want to try, I
> can guide you through. And if you want to contribute docs after that, even
> better. :)
>
>    It is not possible to capture groups and reuse in the RHS. I'm thinking
> about a way to bind variables to arbitrary values in the LHS. If we
> implement that, than it would be possible for you to do that, but not
> possible at this moment.
>
>    Edson
>
> 2007/12/14, Waruzjan Shahbazian <wshahbazian at xiam.nl>:
>   
>> Hi,
>>
>> I need to check in the LHS of my rule if  a given String contains an
>> given substring. What is the best way to do that? I can use regular
>> expression with matches, but is that the best (fastest) solution?
>> (STRING matches "(?i).*SUBSTRING.*"). And can I use regulare expressions
>> capturing groups and than use the results of the groups in the RHS? If
>> not, what is the best methode to do that?
>>
>> Thanks,
>>
>> Waruzjan
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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>     
>
>
>
>   
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