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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2015) ASCIIFoldingFilter: expose folding logic + small improvements to ISOLatin1AccentFilter
Date Thu, 29 Oct 2009 19:49:59 GMT


Robert Muir commented on LUCENE-2015:

bq. ISOLatin1AccentFilter was already modified in Lucene 2.4: see LUCENE-1351

that's interesting, so if someone has a < Lucene 2.4 index built with this filter, its
currently not compatible... 
I guess no one has complained but there could be some conditional logic based on Version to
support those indexes...

> ASCIIFoldingFilter: expose folding logic + small improvements to ISOLatin1AccentFilter
> --------------------------------------------------------------------------------------
>                 Key: LUCENE-2015
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>            Reporter: C├ędrik LIME
>            Priority: Minor
>         Attachments: ASCIIFoldingFilter-no_formatting.patch, Filters.patch, ISOLatin1AccentFilter.patch
> This patch adds a couple of non-ascii chars to ISOLatin1AccentFilter (namely: left &
right single quotation marks, en dash, em dash) which we very frequently encounter in our
projects. I know that this class is now deprecated; this improvement is for legacy code that
hasn't migrated yet.
> It also enables easy access to the ascii folding technique use in ASCIIFoldingFilter
for potential re-use in non-Lucene-related code.

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