allow case sensitive matching via (?-i) in automod regex

[JayDeezus]

I tried to catch messages with a lower case letter via (?-i)[a-z], which I understand to mean "disable case insensitivity, and match any letter from lower case 'a' to lower case 'z'".

This doesn't work at the moment, and is catching all messages with any letter a-z in it, ignoring case. Please allow us to perform case sensitive matching with (?-i), especially since it's mentioned we can do this in the FAQ: https://support.discord.com/hc/en-us/articles/10069840290711-Filter-Messages-Using-Regular-Expressions-Regex

Q: How can I enable or disable regular expression flags, such as case insensitivity?

A: Regular expressions can be used with flags to instruct the compiler how to evaluate the regular expression. The Rust regex crate supports the following flags:

u unicode
i case insensitive
s dot matches newline
m multiline

Case-insensitive and unicode support flags are on by default for every regex pattern. However, you can overwrite these flags or enable other flags by prefixing your regular expression with a modifier. The syntax to enable a modifier is: (?a), and the syntax to disable a monitor is:(?-a), where a is the flag you wish to enable to disable.