end_subnegotiation = text.find(telnet_proto(IAC, SE), position)
if end_subnegotiation > 0:
text = text[:position] + text[end_subnegotiation + 2:]
end_subnegotiation = text.find(telnet_proto(IAC, SE), position)
if end_subnegotiation > 0:
text = text[:position] + text[end_subnegotiation + 2:]