import re
s=r"""B:彼之初_S02E01_第 1 集.mp4
B:彼之初_S02E02_第 2 集.mp4
B:彼之初_S02E03_第 3 集.mp4
B:彼之初_S02E04_第 4 集.mp4
B:彼之初_S02E05_第 5 集.mp4
B:彼之初_S02E06_第 6 集.mp4"""
ms = r"(?P<t>.+?)_S(?P<s>\d+)E(?P<e>\d+)_(?P<sub>.*?)\s?(?P<f>(?:.(?!\.))+$)"
a = [_ for _ in list(filter(None, s.split('\n')))]
b = ['EP{}{}'.format(m.group('e').zfill(2), m.group('f')).strip().upper() for m in [re.match(ms,_) for _ in a]]
for _ in zip(a, b):
print('ren "{}" "{}"'.format(_[0],_[1]))
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