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https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838574#action_12838574
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Shyamal Prasad commented on LUCENE-2167:
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Robert Muir wrote:
{quote}
I would love it if you could produce a grammar that implemented UAX#29!
If so, in my opinion it should become the StandardAnalyzer for the next lucene
version. If I thought I could do it correctly, I would have already done it, as
the support for the unicode properties needed to do this is now in the trunk of
Jflex!
{quote}
I'm not smart enough to know if I should even try to do it at all (leave alone
correctly), but am always willing to learn! Thanks for the references, I will
certainly give it an honest try.
/Shyamal
> StandardTokenizer Javadoc does not correctly describe tokenization around
> punctuation characters
> ------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2167
> URL: https://issues.apache.org/jira/browse/LUCENE-2167
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.4.1, 2.9, 2.9.1, 3.0
> Reporter: Shyamal Prasad
> Priority: Minor
> Attachments: LUCENE-2167.patch, LUCENE-2167.patch
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> The Javadoc for StandardTokenizer states:
> {quote}
> Splits words at punctuation characters, removing punctuation.
> However, a dot that's not followed by whitespace is considered part of a
> token.
> Splits words at hyphens, unless there's a number in the token, in which case
> the whole
> token is interpreted as a product number and is not split.
> {quote}
> This is not accurate. The actual JFlex implementation treats hyphens
> interchangeably with
> punctuation. So, for example "video,mp4,test" results in a *single* token and
> not three tokens
> as the documentation would suggest.
> Additionally, the documentation suggests that "video-mp4-test-again" would
> become a single
> token, but in reality it results in two tokens: "video-mp4-test" and "again".
> IMHO the parser implementation is fine as is since it is hard to keep
> everyone happy, but it is probably
> worth cleaning up the documentation string.
> The patch included here updates the documentation string and adds a few test
> cases to confirm the cases described above.
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