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https://issues.apache.org/jira/browse/LUCENE-2644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922383#action_12922383
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Robert Muir commented on LUCENE-2644:
-------------------------------------
I don't understand this issue, to me the LowerCaseTokenizer explains clearly
what it does:
{noformat}
* LowerCaseTokenizer performs the function of LetterTokenizer
* and LowerCaseFilter together. It divides text at non-letters and converts
* them to lower case.
{noformat}
I think there is a lot of other options if you want to customize tokenization
by numbers, punctuation etc, especially Solr's WordDelimiterFilter.
> LowerCaseTokenizer Does Not Behave As One Might Expect (or Desire)--Given Its
> Name
> ----------------------------------------------------------------------------------
>
> Key: LUCENE-2644
> URL: https://issues.apache.org/jira/browse/LUCENE-2644
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 3.0.2
> Reporter: Scott Gonyea
> Fix For: 4.0
>
> Attachments: LowerCaseTokenizer.patch
>
>
> While I understand some of the reasons for its design, the original
> LowerCaseTokenizer should have been named LowerCaseLetterTokenizer.
> I feel that LowerCaseTokenizer makes too many assumptions about what too
> tokenize, and I have therefore patched it. The *default* behavior will
> remain as it always has--to avoid breaking any implementations for which it's
> being used.
> I have changed LowerCaseTokenizer to extend CharTokenizer (rather than
> LetterTokenizer). LetterTokenizer's functionality was merged into the
> default behavior of LowerCaseTokenizer.
> Getter/Setter methods have been added to the LowerCaseTokenizer Class,
> allowing you to turn on / off tokenizing by white space, numbers, and special
> (Non-Alpha/Numeric) characters.
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