python替換部分參數(shù), 進行局部替換

使用\1,\2

import re
s = 'i o u! u 2?'
s = re.sub('([.!?])', ' \\1', s)  # re.sub(r'([.!?])', r' \1', s)
print(s)

使用lambda表達式

import re
test_str = 'NumberInt(1),NumberInt(2),NumberInt(3)'
regex = r"(NumberInt\(*)(\d)(\))"
result = re.sub(regex, lambda x:x.group(2), test_str)