my $str = "auth_plugin_stack = a,b,EXT::USCC::USCCAuth,c,d"; # should return auth_plugin_stack = a,b,c,d

##</code><code>##

my $str = "auth_plugin_stack = EXT::USCC::USCCAuth"; # should return auth_plugin_stack = 
my $str = "auth_plugin_stack = a,b,EXT::USCC::USCCAuth"; # should return auth_plugin_stack = a,b
my $str = "auth_plugin_stack = EXT::USCC::USCCAuth,c,d"; # should return auth_plugin_stack = c,d