import re
replacements = []
def repl(m):
replacements.append(m.group(0))
return "";
title_old = "FOO BAR PART 1"
print(re.sub(r"PART [0-9]*$", repl, title_old))
print(replacements)
aW1wb3J0IHJlCgpyZXBsYWNlbWVudHMgPSBbXQpkZWYgcmVwbChtKToKCXJlcGxhY2VtZW50cy5hcHBlbmQobS5ncm91cCgwKSkKCXJldHVybiAiIjsKCnRpdGxlX29sZCA9ICJGT08gQkFSIFBBUlQgMSIKcHJpbnQocmUuc3ViKHIiUEFSVCBbMC05XSokIiwgcmVwbCwgdGl0bGVfb2xkKSkKcHJpbnQocmVwbGFjZW1lbnRzKQ==