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https://issues.apache.org/jira/browse/LUCENE-3922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238329#comment-13238329
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Koji Sekiguchi commented on LUCENE-3922:
----------------------------------------

We, RONDHUIT, have done this kind of normalization (and more!). You may be 
interested in:

http://www.rondhuit-demo.com/RCSS/api/overview-summary.html#featured-japanese

||Summary||normalization sample||
|漢数字=>算用数字正規化|四七=>47, 四十七=>47, 四拾七=>47, 四〇七=>407|
|和暦=>西暦正規化|昭和四七年、昭和四十七年、昭和四拾七年=>1972年, 昭和六十四年、平成元年=>1989年|

                
> Add Japanese Kanji number normalization to Kuromoji
> ---------------------------------------------------
>
>                 Key: LUCENE-3922
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3922
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: modules/analysis
>    Affects Versions: 4.0
>            Reporter: Kazuaki Hiraga
>              Labels: features
>
> Japanese people use Kanji numerals instead of Arabic numerals for writing 
> price, address and so on. i.e 12万4800円(124,800JPY), 二番町三ノ二(3-2 Nibancho) and 
> 十二月(December).  So, we would like to normalize those Kanji numerals to Arabic 
> numerals (I don't think we need to have a capability to normalize to Kanji 
> numerals).
>  

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