Ì 建议先提取第一个数字，然后在没有用 re.sub的其他数字括起来的情况下增加所有出现的数字>:

Ì suggest first extracting the first number and then increment all occurrences of this number when it is not enclosed with other digits with re.sub:

import re
a1 = 'images1subimages1/folder100/hello1.png'
num0_m = re.search(r'\d+', a1)                  # Extract the first chunk of 1+ digits
if num0_m:                                      # If there is a match
    rx = r'(?<!\d){}(?!\d)'.format(num0_m.group())  # Set a regex to match the number when not inside other digits
    print(re.sub(rx, lambda x: str(int(x.group())+1), a1)) # Increment the matched numbers
    # => images2subimages2/folder100/hello2.png

查看 Python 演示