Fix problem with storing value into a variable that has same prefix
Fix problem with storing value into a variable that has same prefix

yeahdongcn/SEnginx,vkholodkov/nginx-eval-module,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx