Nginx_help_doc.md

Nginx

HttpRewriteModule

1. the name of a variable; false vales are: empty string("", or any string starting with "0");
2. a comparison of a variable using the = and != operators;
3. pattern matching with regular expressions:
   ~ performs a case-sensitive match
   ~* performs a case-insensitive match i.e firefox matches Firefox
!~ and !~* mean the opposite, doesn't match.
4. check for existence of a file using the -f or !-f operators;
5. check for existence of a directory using -d or !-d;
6. check for existence of a file, directory or symbolic link using -e or !-e;
7. check whether a file is executable using -x or !-x.