[DOCS] Clarify regex character range case insensitivity limitations #125412
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Flagged by @dadoonet in Slack: > Hey team. There's an interesting discussion on discuss about Lucene regex support. Our documentation says things like: [a-c] # matches 'a', 'b', or 'c' [^a-c] # matches any character except 'a', 'b', or 'c' Which is correct unless you use as well case_insensitive: true option. In which case you would expect B to match [a-c]. But it does not work that way and it's a known limitation as Robert answered in apache/lucene#14378 (comment). Could we document that somehow?
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* Update regexp-syntax.md 9.x equivalent of #125412 * use md syntax
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…c#125413) * Update regexp-syntax.md 9.x equivalent of elastic#125412 * use md syntax
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…c#125413) * Update regexp-syntax.md 9.x equivalent of elastic#125412 * use md syntax
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…c#125413) * Update regexp-syntax.md 9.x equivalent of elastic#125412 * use md syntax
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Flagged by @dadoonet in Slack: