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Luke Lucene QueryParser Case Sensitivity

In Luke, if I enter the search expression docfile:Tomatoes.jpg* the parsed query is docfile:Tomatoes.jpg*. When the search expression is docfile:Tomatoes.jpg, (no asterisk *) the parsed query is docfile:tomatoes.jpg with a lowercase 't'.

  1. Why?
  2. How can I change this?

BTW, using org.apache.lucene.analysis.standard.StandardAnalyzer.

Solution

  • StandardAnalyzer uses LowerCaseFilter which means it lowercases your queries and data. This is described in the Javadocs http://lucene.apache.org/java/3_0_1/api/core/org/apache/lucene/analysis/standard/StandardAnalyzer.html.

    If I remember correctly WhitespaceAnalyzer does not lowercase, but verify it suits your needs http://lucene.apache.org/java/3_0_1/api/core/org/apache/lucene/analysis/WhitespaceAnalyzer.html.