issue in searching uppercase string with wildcard

I am using solr search. my search field contains both diamond and Diamond开发者_开发知识库. But when i search for Diamond or diamond it gives me correct results. But when i search for Diamond* or diamond*, I get result for diamond* but no results found for Diamond* . although i have applied <filter class="solr.LowerCaseFilterFactory"/>.

would you please suggest me what can be the issue.

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"Unlike other types of Lucene queries, Wildcard, Prefix, and Fuzzy queries are not passed through the Analyzer, which is the component that performs operations such as stemming and lowercasing"

http://wiki.apache.org/lucene-java/LuceneFAQ#Are_Wildcard.2C_Prefix.2C_and_Fuzzy_queries_case_sensitive.3F

Inside this link there's the workaround for this problem