python正则表达式模糊匹配_Python正则表达式的几种匹配用法

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

ifre.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

ifre.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)

ifmatch:

# 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)

ifmatch:

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)

ifmatch:

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)

formatchinre.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)

ifreobj.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

ifreobj.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)

ifmatch:

# 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)

ifmatch:

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)

ifmatch:

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)

ifmatch:

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)

reobj=re.compile(regex)

formatchinreobj.finditer(subject):

# match start:match.start()

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

# matched text:match.group()

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

result=reobj.split(subject)