Hi, I'm implementing regex search on ES 8.16 (using java client) against fields of type keyword and I came across strange issue when sending the case_insensitive: true option. "[abc]+" -> "abc", "ABC" "[ABC]+" -> "abc", "ABC" "[a-c]+" -> "abc" "[A-C]+" -> "ABC" Is there an explanation for this …

Case insensitive regex query with character range

petrsimon (Petr Šimon) March 20, 2025, 3:42pm 9

Seems like it's a known limitation of Lucene. Perhaps it would be nice to document it also in ES?

2 Likes

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Case insensitive regex query with character range

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