Python正则表达式使⽤经典实例
下⾯列出Python正则表达式的⼏种匹配⽤法，具体内容如下所⽰：
1.测试正则表达式是否匹配字符串的全部或部分
regex=ur"" #正则表达式
if re.search(regex, subject):
do_something()
else:
do_anotherthing()
2.测试正则表达式是否匹配整个字符串
regex=ur"\Z" #正则表达式末尾以\Z结束
if re.match(regex, subject):
    do_something()
else:
    do_anotherthing()
3.创建⼀个匹配对象，然后通过该对象获得匹配细节(Create an object with details about how the regex matches (part of) a string)
regex=ur"" #正则表达式
match = re.search(regex, subject)
if match:
    # match start: match.start()
    # match end (exclusive): d()
    # matched text: up()
    do_something()
else:
    do_anotherthing()
4.获取正则表达式所匹配的⼦串(Get the part of a string matched by the regex)
regex=ur"" #正则表达式
match = re.search(regex, subject)
if match:
    result = up()
else:
    result = ""
5. 获取捕获组所匹配的⼦串(Get the part of a string matched by a capturing group)
regex=ur"" #正则表达式
match = re.search(regex, subject)
if match:
    result = up(1)
else:
    result = ""
6. 获取有名组所匹配的⼦串(Get the part of a string matched by a named group)
regex=ur"" #正则表达式
match = re.search(regex, subject)
if match:
result = up"groupname")
else:
result = ""
7. 将字符串中所有匹配的⼦串放⼊数组中(Get an array of all regex matches in a string)
result = re.findall(regex, subject)
8.遍历所有匹配的⼦串(Iterate over all matches in a string)
for match in re.finditer(r"<(.*?)\s*.*?/\1>", subject)
    # match start: match.start()
regex匹配    # match end (exclusive): d()
    # matched text: up()
9.通过正则表达式字符串创建⼀个正则表达式对象(Create an object to use the same regex for many operations)
reobj = repile(regex)
10.⽤法１的正则表达式对象版本（use regex object for if/else branch whether (part of) a string can be matched）
reobj = repile(regex)
if reobj.search(subject):
    do_something()
else:
    do_anotherthing()
11.⽤法２的正则表达式对象版本（use regex object for if/else branch whether a string can be matched entirely）
reobj = repile(r"\Z")　＃正则表达式末尾以\Z 结束
if reobj.match(subject):
    do_something()
else:
    do_anotherthing()
12.创建⼀个正则表达式对象，然后通过该对象获得匹配细节（Create an object with details about how the regex object matches (part of) a string）
reobj = repile(regex)
match = reobj.search(subject)
if match:
    # match start: match.start()
    # match end (exclusive): d()
    # matched text: up()
    do_something()
else:
    do_anotherthing()
13.⽤正则表达式对象获取匹配⼦串（Use regex object to get the part of a string matched by the regex）
reobj = repile(regex)
match = reobj.search(subject)
if match:
    result = up()
else:
    result = ""
14.⽤正则表达式对象获取捕获组所匹配的⼦串（Use regex object to get the part of a string matched by a capturing group）reobj = repile(regex)
match = reobj.search(subject)
if match:
    result = up(1)
else:
    result = ""
15.⽤正则表达式对象获取有名组所匹配的⼦串（Use regex object to get the part of a string matched by a named group）reobj = repile(regex)
match = reobj.search(subject)
if match:
    result = up("groupname")
else:
    result = ""
16.⽤正则表达式对象获取所有匹配⼦串并放⼊数组（Use regex object to get an array of all regex matches in a string）reobj = repile(regex)
result = reobj.findall(subject)
17.通过正则表达式对象遍历所有匹配⼦串（Use regex object to iterate over all matches in a string）
reobj = repile(regex)
for match in reobj.finditer(subject):
    # match start: match.start()
    # match end (exclusive): d()
    # matched text: up()
字符串替换
1.替换所有匹配的⼦串
#⽤newstring替换subject中所有与正则表达式regex匹配的⼦串result = re.sub(regex, newstring, subject)
2.替换所有匹配的⼦串（使⽤正则表达式对象）reobj = repile(regex)
result = reobj.sub(newstring, subject)
字符串拆分
1.字符串拆分
result = re.split(regex, subject)
2.字符串拆分（使⽤正则表⽰式对象）
reobj = repile(regex)
result = reobj.split(subject)

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