Python正则匹配之有名分组

参考：http://www.cnblogs.com/huxi/archive/2010/07/04/1771073.html

# 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)