I later realised my statement was wrong. I did not test all search terms. 
I was only testing the folder: search term. 

It seems folder: search is always case-sensitive and it doesn't allow wild cards. 
So if I want to find messages in a specific folder, I'll have to spell the folder name case-sensitively,
and I'll have to either remember the full path or use regex. Is this understanding correct? 
If it is, then I would say it's a bit unexpected and odd. 

On Wed, 18 Nov 2020 at 22:28, David Bremner <david@tethera.net> wrote:
Wenlong Dai <whudwl@gmail.com> writes:

> Based on my usage and testing, it seems to me that all notmuch searches are
> case-sensitive.
> Is this true?
> Is there a way to do case-insensitive search?

Most searches (other than boolean prefixes and regex searches) are in
fact case insensitive. The definition of case is English-centric. Can
you give an example of a search that is case-sensitive that you are
expecting to be case insensitive?

d



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Kind Regards,
Wenlong Dai