regex=ur"" #正则表达式

match = re.search(regex, subject)

if match:

# match start: match.start()

# match end (exclusive): atch.end()

# matched text: match.group()

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 = match.group()

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 = match.group(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 = match.group"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"", subject)

# match start: match.start()

# match end (exclusive): atch.end()

# matched text: match.group()

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 = re.compile(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 = re.compile(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 = re.compile(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 = re.compile(regex)

match = reobj.search(subject)

if match:

# match start: match.start()

# match end (exclusive): atch.end()

# matched text: match.group()

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 = re.compile(regex)

match = reobj.search(subject)

if match:

result = match.group()

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 = re.compile(regex)

match = reobj.search(subject)

if match:

result = match.group(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 = re.compile(regex)

match = reobj.search(subject)

if match:

result = match.group("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 = re.compile(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)

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