1.取消使用lua内置的字符串串切割方式，使用openresty自带的ngx.re.split方法，提高性能和代码阅读性 2.注释一段无用的代码 #5
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luashiping
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local ret = tools.match('/'..svc_code,elem['uri'])这行代码无用，可以取消掉。该函数内部使用了Lua自带的模式匹配，这不仅是出于性能方面的考虑(不能被 JIT，而且被编译过一次的模式也不会被缓存)，还因为 Lua 自带的正则是自成体系的，并非 PCRE 规范，这对于绝大部分开发者来说都是徒增烦恼。