import re
sts = ['Skank Up [feat. Ding Dong] (Oh Lawd)','Skank Up (Oh Lawd) [feat. Ding Dong]', 'Skank Up (Oh Lawd) (feat. Ding Dong)']
for st in sts:
print(re.sub(r'\s*(?:\[feat[^][]+]|\(feat[^()]+\))', '', st))
aW1wb3J0IHJlCnN0cyA9IFsnU2thbmsgVXAgW2ZlYXQuIERpbmcgRG9uZ10gKE9oIExhd2QpJywnU2thbmsgVXAgKE9oIExhd2QpIFtmZWF0LiBEaW5nIERvbmddJywgJ1NrYW5rIFVwIChPaCBMYXdkKSAoZmVhdC4gRGluZyBEb25nKSddCmZvciBzdCBpbiBzdHM6CglwcmludChyZS5zdWIocidccyooPzpcW2ZlYXRbXl1bXStdfFwoZmVhdFteKCldK1wpKScsICcnLCBzdCkp