This script takes a string generated by msfvenom on bt5r3 via PIPE and will clean the raw shellcode

cleanshellcodebt5r3.py

#!/usr/bin/env python
# Author: @itsecurityco 
# This script takes a string generated 
# by msfvenom on bt5r3 via PIPE 
# and will clean the raw shellcode

import sys
import re

if sys.stdin.isatty():
  print " usage: msfvenom [options] <var=val> | python %s" % sys.argv[0]
  exit(0)

shellcode = ""
for line in sys.stdin:
  shellcode += line

match = re.findall("x([a-z0-9]{2})", shellcode)
if match:
  print "".join(match)