import re re.search(r‘([1]\d\d|2[0-4]\d|25[0-5])‘,‘192‘) #re.search(r‘([01]\d\d)‘,‘1XX‘) #[01] \d \d # 1 0-9 0-9 #re.search(r‘(2[0-4]\d)‘,‘2XX‘) #2 [0-4] \d #2 0-4 0-9 #re.search(r‘(25[0-5])‘,‘25X‘) #25 [0-5] #25 0-5 re.search(r‘(([01]{0,1}\d{0,1}\d|2[0-4]\d|25[0-5])\.){3}([01]{0,1}\d{0,1}\d|2[0-4]\d|25[0-5])‘,‘192.168.103.114‘) #{}重复 咧:{3}重复3次；{0,1}重复1次或2次
备注：255.255.255.255为广播地址；0.0.0.0保留地址
原文：https://www.cnblogs.com/moongo/p/12099212.html