import re
regex = r"'lo'(?:,\s*)?|[][']"
test_str = "['lo', 'ens4', 'tun0', 'tun1']"
result = re.sub(regex, "", test_str)
if result:
print (result)
aW1wb3J0IHJlCnJlZ2V4ID0gciInbG8nKD86LFxzKik/fFtdWyddIgp0ZXN0X3N0ciA9ICJbJ2xvJywgJ2VuczQnLCAndHVuMCcsICd0dW4xJ10iCnJlc3VsdCA9IHJlLnN1YihyZWdleCwgIiIsIHRlc3Rfc3RyKQoKaWYgcmVzdWx0OgogICAgcHJpbnQgKHJlc3VsdCkK