The other day, I ran across the following issue: I was looking to split a value using upper case and lower case characters. Here’s an example query:

SELECT PATINDEX('%[a-z][A-Z]%',
    'testValue' COLLATE Finnish_Swedish_CS_AS) AS offset

I expected this query to return the value 4, because at that offset in the string, there is a lower case character (t) followed directly by an upper case character (V). However, in practice, this query returns the value 1.

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