Python中正则表达式的用法实例汇总

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): match.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)

reobj = re.compile(regex)
for match in reobj.finditer(subject):
  # match start: match.start()
  # match end (exclusive): match.end()
  # matched text: match.group()

感兴趣的读者可以动手调试一下本文实例代码，相信会有新的收获。