# re.match

import re

m = re.match(r'(\w+) (?P<sign>.*)', 'hello standby!')

print(type(m))                # <class '_sre.SRE_Match'>

print(m)                      # <_sre.SRE_Match object; span=(0, 14), match='hello standby!'>

print(m.groupdict())          # {'sign': 'standby!'}

# re.search

import re

ret = re.search("(?P<arg_name>\d+)","hello456liu999")

print(ret)                      # <_sre.SRE_Match object; span=(5, 8), match='456'>

li = ret.group("arg_name")

print(type(li))                 # <class 'str'>

print(li)                       # 456

# re.match匹配ip地址

import re

# 将正则表达式编译成Pattern对象

pattern = re.compile(r'(?<![\.\d])(?:\d{1,3}\.){3}\d{1,3}(?![\.\d])')

# 使用Pattern匹配文本，获得匹配结果，无法匹配时将返回None

ip_list = [

    '1.1.1.1',

    'asasas',

    '098121212121290808',

    '10.10.12.1',

    '188.12.23.4',

]

for ip in ip_list:

    if pattern.match(ip):

        print(ip)