Changing Case of Variables in Nginx

Hi,

I am trying to change the case of a variable to all lowercase. I know
there
is no function to do this, but I have been trying to do it with pcre and
it
is not working. I keep getting this…

pcre_compile() failed: PCRE does not support \L, \l, \N, \U, or \u

Is there a way to change the case of a variable ($request_uri, etc.) to
all
lowercase?

Thanks,

John Draper

I have a similar question.
I have a website hosted on windows, file names are mixed up uppercase
and lowercase, I want to know if I can tell nignx just to ignore file
names’ cases, and fetch the right file to users if I move the website to
linux server.