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https://issues.apache.org/jira/browse/LUCENE-3748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199204#comment-13199204
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Steven Rowe commented on LUCENE-3748:
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+1, and +1 to include U+FF07.
There are several other characters listed with U+0027 APOSTROPHE in
http://www.unicode.org/charts/PDF/U0000.pdf that could be interpreted visually
as an English apostrophe, e.g. U+02BC MODIFIER LETTER APOSTROPHE, but it would
be unusual for people to use those characters as apostrophes in English text,
so I think it would be fine to exclude them. (By contrast, the Unicode
standard says that U+2019 is the *preferred* apostrophe form.)
> EnglishPossessiveFilter should work with Unicode right single quotation mark
> ----------------------------------------------------------------------------
>
> Key: LUCENE-3748
> URL: https://issues.apache.org/jira/browse/LUCENE-3748
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 3.1, 3.2, 3.4, 3.5
> Reporter: David Croley
> Priority: Minor
> Attachments: LucenePatch
>
>
> The current EnglishPossessiveFilter (used in EnglishAnalyzer) removes
> possessives using only the '\'' character (plus 's' or 'S'), but some common
> systems (German?) insert the Unicode "\u2019" (RIGHT SINGLE QUOTATION MARK)
> instead and this is not removed when processing UTF-8 text. I propose to
> change EnglishPossesiveFilter to support '\u2019' as an alternative to '\''.
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