import re
zippedFileNames=['0001_foo1.csv', 'def.bz', '0000_foo2.csv.gz']
unzippedFileNames = []
for name in zippedFileNames:
m = re.match(r"\d+_(.*\.csv)", name)
if m:
unzippedFileNames.append(m.group(1))
print(unzippedFileNames)
aW1wb3J0IHJlCnppcHBlZEZpbGVOYW1lcz1bJzAwMDFfZm9vMS5jc3YnLCAnZGVmLmJ6JywgJzAwMDBfZm9vMi5jc3YuZ3onXQp1bnppcHBlZEZpbGVOYW1lcyA9IFtdCmZvciBuYW1lIGluIHppcHBlZEZpbGVOYW1lczoKICBtID0gcmUubWF0Y2gociJcZCtfKC4qXC5jc3YpIiwgbmFtZSkKICBpZiBtOgogIAl1bnppcHBlZEZpbGVOYW1lcy5hcHBlbmQobS5ncm91cCgxKSkKcHJpbnQodW56aXBwZWRGaWxlTmFtZXMp