> = string.find("Hello Lua user", "Lua", 1) -- start at first character 7 9 > = string.find("Hello Lua user", "Lua", 8) -- "Lua" not found again after character 8 nil > = string.find("Hello Lua user", "e", -5) -- first "e" 5 characters from the end 13 13 The ...
> = string.byte("ABCDE") -- no index, so the first character 65 > = string.byte("ABCDE",1) -- indexes start at 1 65 > = string.byte("ABCDE",0) -- we're not using C > = string.byte("ABCDE",100) -- index out of range, no value returned > = string.byte("ABCDE",3,4...
the substrings of the subject string that match captures are stored (captured)forfuture use. Captures are numbered according to their left parentheses. For instance,inthe pattern"(a*(.)%w(%s*))", the part of the string matching"a*(.)%w(%s*)"is stored as the first capture...
对于string类型的值,可以使用OO的方式处理,如string.byte(s.i)可以被写成s:byte(i) It also sets a metatable for strings where the __index field points to the string table. Therefore, you can use the string functions in object-oriented style. For instance, string.byte(s, i) can be written ...
int c = zgetc(p->z); /* read first character */ if (c == LUA_SIGNATURE[0]) { checkmode(L, p->mode, "binary"); cl = luaU_undump(L, p->z, p->name); } else { checkmode(L, p->mode, "text"); cl = luaY_parser(L, p->z, &p->buff, &p->dyd, p->name, c)...
Lua 中的所有值都是一致 (first-class) 的。 这意味着所有的值都可以被放在变量里,当作参数传递到另一个函数中,并被函数作为结果返回。 Lua 中有八种基本类型: nil, boolean, number, string, function, userdata, thread, and table. Nil 类型只有一种值 nil ,它的主要用途用于标表识和别的任何值的差异...
When indexing a string in Lua, the first character is at position 1 (not at 0, as in C).Indices are allowed to be negative and are interpreted as indexing backwards, from the end of the string. Thus, the last character is at position -1, and so on. The string library provides all...
The err (a string) contains a message of why opening might have failed (the function will still return session too).local session = require "resty.session".open() -- OR local session, err, exists = require "resty.session".open({ audience = "my-application", }) ...
(2,t[2]), ···, up to the first integer key absent from the table. load (func [, chunkname]) Loads a chunk using function func to get its pieces. Each call to func must return a string that concatenates with previous results. A return of nil (or no value) signals the end of...
shared metatables for string, bool, etc are shared across Globals instances in the same class loader orphaned threads will not be collected unless garbage collection is run and sufficient time elapses File Character Encoding For a non ASCII-compatible encoding such as EBSDIC, however, there are...