"Texas Hold ' Em development record" LUA extracts strings in Chinese and English

Local TB = {}
Local Leninbyte = #str
Local i = 1
While I < (leninbyte + 1) do
Local curbyte = String.byte (str, i)
Local Sztype
Local Bytecount=1
If Curbyte>0 and curbyte<=127 then
If curbyte>=48 and curbyte<=57 then
sztype = ' num '
ElseIf (curbyte>=97 and curbyte<=122) or
(curbyte>=65 and curbyte<=90) then
Sztype = ' letter '
End
ByteCount = 1
ElseIf curbyte>=192 and curbyte<223 Then
ByteCount = 2
ElseIf curbyte>=224 and curbyte<239 Then
ByteCount = 3
ElseIf curbyte>=240 and curbyte<=247 Then
ByteCount = 4
End

Local char = string.sub (str, I, i+bytecount-1)
i = i + byteCount

Local item = {}
if ByteCount = = 1 Then
Item.type = Sztype and Sztype or "en"
Else
Item.type = "cn"
End

Item.value = Char

Table.insert (TB, item)
End

Texas Hold ' Em development note lua extracts Chinese and English in strings