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https://issues.apache.org/jira/browse/LUCENE-2074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784868#action_12784868
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Uwe Schindler commented on LUCENE-2074:
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So I should also be able to regenerate the old grammar with %Unicode 3.1 (that
was the version of JDK 1.4?) - that would be fine, because I could simply
provide another grammar file to regenerate all parsers!
That would be helpful as a first step for 3.1!
> Use a separate JFlex generated Unicode 4 by Java 5 compatible
> StandardTokenizer
> -------------------------------------------------------------------------------
>
> Key: LUCENE-2074
> URL: https://issues.apache.org/jira/browse/LUCENE-2074
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 3.1
>
> Attachments: jflex-1.4.1-vs-1.5-snapshot.diff, jflexwarning.patch,
> LUCENE-2074-lucene30.patch, LUCENE-2074.patch, LUCENE-2074.patch,
> LUCENE-2074.patch, LUCENE-2074.patch
>
>
> The current trunk version of StandardTokenizerImpl was generated by Java 1.4
> (according to the warning). In Java 3.0 we switch to Java 1.5, so we should
> regenerate the file.
> After regeneration the Tokenizer behaves different for some characters.
> Because of that we should only use the new TokenizerImpl when
> Version.LUCENE_30 or LUCENE_31 is used as matchVersion.
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