Case insensitive exact location match?

[itpp2012]

B.R. Wrote:
-------------------------------------------------------
> 2
> ​^4 = all 16 combinations. Hopefully the 'test' sting is only 4
> characters
> long...
> 
> Case-insensitiveness is no-trivial check, and if needed PCRE are here
> for
> that through regex locations.
> What is wrong with them already?​

At assembly level alot, +-20 bytes including an if or alot more when it has
to go through pcre.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,258977,259005#msg-259005