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https://issues.apache.org/jira/browse/NUTCH-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13058036#comment-13058036
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Julien Nioche commented on NUTCH-1013:
--------------------------------------

Thanks for the details Markus. I don't think that 17% justifies keeping ORO, 
especially that as you pointed out j.u.regex has more functionalities and is 
maintained. I'll have a look at the patch tomorrow

> Migrate RegexURLNormalizer from Apache ORO to java.util.regex
> -------------------------------------------------------------
>
>                 Key: NUTCH-1013
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1013
>             Project: Nutch
>          Issue Type: Improvement
>            Reporter: Markus Jelsma
>            Assignee: Markus Jelsma
>             Fix For: 1.4, 2.0
>
>         Attachments: NUTCH-1013-1.4.patch
>
>
> Apache ORO uses old Perl 5-style regular expressions. Features such as the 
> powerful lookbehind are not available. The project has become retired as 
> well. 

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