python 快速介绍re.sub

Posted 2021-05-10

post_number = '770-0047'
# grouping by ()
converted_post_number = re.sub(r'(\d)(\d)(\d)-(\d)(\d)(\d)(\d)',r'\1\2\3_\4\5\6\7',post_number)
print(converted_post_number) #=> 770_0047