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List:       jakarta-oro-user
Subject:    Re: AW: Named Subgroups
From:       Hannes Koller <hkoller () ifit ! uni-klu ! ac ! at>
Date:       2005-09-16 10:01:32
Message-ID: 432A97FC.2060702 () ifit ! uni-klu ! ac ! at
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Thanks for your quick reply.  :-)

The problem is, that I actually have several  regular expressions. To be 
more specific I will give you an actual example (although a very simple 
one. I am afraid I have more complex problems to solve, but the 
principle is essentially the same) :


I am working on an Information Extraction Task. I have a Regular 
Expression which matches a Number with a  Unit.. something like   " 12 
cm "  .. i want  to have a subgroup, which  returns the number part of 
the match, and an other subgroup wich returns the unit part. So far this 
would be easy with just the subgroup numbering  that ORO Provides 
(Group1  = number part, Group 2 = unit part).

 My Problem is that numbers can also be written like this "cm 12"  , 
which can be found by a different regular expression, but then the 
groups which contain the number and unit part of the match are 
switched.  (Group 1 = unit , Group 2 = number).

 What I want to do is have a (probably large) List of Regular 
Expressions which all  match certain  "Number with Unit" patterns,  and 
access the number and unit parts of this matches in a consistent way.   
(always with   match.getGroup("Number") and match.getGroup("Unit"). I 
hope this helps to clarify why I need to actually *name* the groups in a 
match, and can not use the sequential numbering.

Regards,
    Hannnes


Michael Rachow wrote:

>I'm not sure about understanding your actual problem,
>but maybe creating simple constants
>like static int DAY = 1 and using match.getGroup(DAY)
>would give you some more transparency?
>
>Regards,
>Michael
>
>-----Ursprüngliche Nachricht-----
>Von: Hannes Koller [mailto:hkoller@ifit.uni-klu.ac.at]
>Gesendet: Freitag, 16. September 2005 11:18
>An: oro-user@jakarta.apache.org
>Betreff: Named Subgroups
>
>
>Hi,
>I have been using ORO for some time and have encountered a problem. I 
>need to give names to Subgroups (Instead of (or in addition to) the 
>numbering that is done automatically). Is there a way to do something like
>
>    (?<Day>\d{2})/(?<Month>\d{2})/(?<Year>\d{4})
>
> which should produce  3 named subgroups  (Day, Month, Year)  and access 
>them in java like
>
>       match.getGroup("Day")
>
>
>Is a feature like this already implemented in ORO and I am missing it, 
>or is it planned for the near future? This would greatly ease my task. TIA
>
>Hannes Koller
>
>
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