【入门夯实】字符串长度与中文： 按字节计数的陷阱

local s = "裁决"
print(#s)

local s = "裁决"
local _, count = string.gsub(s, "[\128-\255][\128-\191]*", "")
print(count + select(2, string.gsub(s, "[%1-\127]", "")) * 0)

local function charCount(s)
    local n = 0
    for _ in string.gmatch(s, "[\128-\255][\128-\191]*") do
        n = n + 1
    end
    for _ in string.gmatch(s, "[%c\32-\126]") do
        n = n + 1
    end
    return n
end
print(charCount("裁决AB"))

local s = "裁决之杖"
print(string.sub(s, 1, 6))