- autoconf environment
- syntax verification
- command line query tool

- newline in error message
$ ./cfg_test sample2.cfg 
ERROR: <line 7, column 1: `1b;
<}> quu'>

- cfg_t

rewrite-uri <regex> <subst> { <rewrite-cond> }
rewrite-uri ^/(.*) /path/$1 --redirect=permanent "{
    %{SOURCE} != "x" 
}";