English Convert utf8 encoding to string

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Cheung - Wen
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This function is for lua hook sayutf8:
Code:
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local function utf8_from(t)
     local bytearr = {}
     for _, v in ipairs(t) do
          local utf8byte = v < 0 and (0xff + v + 1) or v
          table.insert(bytearr, string.char(utf8byte))
     end
     return table.concat(bytearr)
end

local function utf8_expend(str) -- Put message
     local t = {}
     for num in str:gmatch('[^x]+') do
          table.insert(t, tonumber(num, 16))
     end
     return utf8_from(t)
end

For example:
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print(utf8_expend('x61x7A')) --> 'az'
print(utf8_expend('xE4xBDxA0xE5xA5xBD')) --> '你好'
print(utf8_expend('xD0x9FxD1x80xD0xB8xD0xB2xD0xB5xD1x82')) --> 'Привет'

Sorry, my English is poor
CS2D Forever :Z
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