In elasticsearch 5.6, for getting the data, I am using values as regex in the query.
The query is working for only lowercase regex values, even a single uppercase letter disqualifies the query.
For Example
_search?q=rv11:/.reader./ --> working fine, but
_search?q=rv11:/.Reader./ or
_search?q=rv11:/.READER./ --> are not working
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