docs not clear about case sensitive expression and supported regex syntax

[Dieterbe]

Hi, I read https://grafana.com/docs/features/datasources/loki/
It does not describe case sensitive of query expression (regex) part of the query.
In my experience, it is case sensitive. is there a way to make it insensitive? either way, seems like it could be described in the docs.

[Dieterbe]

actually, it would also be beneficial to describe the dialect/syntax of regex supported.
for example, seems like alternation ("or" as in foo|bar) works, so seems like posix extended regex works

[steven-sheehy]

Loki is not case insensitive by default, but can be by adding golang regex modifiers (?i) before the regex. I changed Grafana to add these by default when sending the query. But yes, more docs would be nice.