Lucene case sensitive & insensitive search

Question

I have a Lucene index which is currently case sensitive. I want to add the option of having a case insensitive search as a fall-back. This means that result

Answer 1

The Lucene search is case sensitive, it's just that all input is usually lower-cased upon passing through Queryparser , so it feels like it's case insensitive. In other words, don't lower-case your input before indexing, and don't lower-case your queries (i.e. pick an Analyzer that doesn't lower-case) keyword-analyzer for example.

[setLowercaseExpandedTerms][1](boolean lowercaseExpandedTerms)

you can index the terms using case sensitive analyzer and when u want case-insensitive query use a class which doesnot convert your terms to lowercase

look at Wildcard, Prefix, and Fuzzy queries