wxyz0001

import re

with open('E:\\news\\基督山伯爵.txt', 'r+', encoding='gbk') as f:
    data = f.read()
    match = re.sub(r'\n\s?第', '\n###第', data)
    with open('E:\\news\\###基督山伯爵.txt', 'w') as ff:
        ff.write(match + '\n' + '###')
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