advreplace.py

import re

file = '/home/pi/.advance/advmame.rc'
# search for '] keyboard[#,something]' or for 'scan0] or keyboard[#,something]'
pattern = re.compile("((?<=\]\s)|(?<=scan0\]\sor\s))keyboard\[\d,\w+\](?!\sor\skeyboard\[\d,\w+\])")

def keyboard_duplicate(matchobj):
	return matchobj.group(0).replace('[1,', '[0,') + ' or ' + matchobj.group(0).replace('[0,', '[1,')

with open(file, 'r') as f:
	data = f.read()

data = pattern.sub(keyboard_duplicate, data, re.IGNORECASE)

with open(file, 'w') as f:
	f.write(data)