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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1787) Standard Tokenizer doesn't recognise I.B.M as Acronym, it requires it ends with a dot i.e I.B.M.
Date Thu, 06 Aug 2009 20:15:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740233#action_12740233
] 

Shai Erera commented on LUCENE-1787:
------------------------------------

We should fix ACRONYM, not ACRONYM_DEP right? ACRONYM_DEP is deprecated and will be removed
in 3.0. Instead, you can change ACRONYM to
{LETTER} ("." {LETTER})+ (".")?  which will match I.B.M. and I.B.M. For the first example,
it will eat the last dot as well, which IMO is important.

BTW, my ACRONYM rule looks like this:

// Acronyms: U.S.A., I.B.M., however also U.S.A (without the last "."). In addition, it recognizes
R&D, AT&T, A&B&C.
ACRONYM =  {LETTER} ("." {LETTER})+ (".")? 
						| {LETTER}{1,2} (("&") {LETTER})+

Don't know if this change is allowed at this point though.

> Standard Tokenizer doesn't recognise I.B.M as Acronym, it requires it ends with a dot
i.e I.B.M.
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1787
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1787
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>    Affects Versions: 2.9
>            Reporter: Paul taylor
>
> Standard Tokenzizer doesn't recognise I.B.M it requires it end with a dot i.e I.B.M.
This is particulary problematic if I.B.M is added tot the index, with the StandardAnalyser
it will get added as  IBM , a search for I.B.M will not match because I.B.M will be left as
is, I would expect a match in this scenario
> I think it could be fixed by modifying the  grammar ACRONYM_DEP  in StandardTokenizerImpl.jflex
so that it also supports
> {ALPHANUM} ("." {ALPHANUM})+
> dot only required between each character, (I'm not familiar with jflex syntax )

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