[总结]lua 字符串分隔，支持以单个字符或字符串进行分隔

local function explode ( _str, seperator)  
    local pos, arr = 0, {}  
    for st, sp in function() return string.find( _str, seperator, pos, true ) end do  
      table.insert(arr, string.sub(_str, pos, st-1 ))  
      pos = sp + 1  
    end  
    table.insert(arr, string.sub( _str, pos))  
    return arr  
end local function explode ( _str, seperator)