Python中正则表达式的用法实例汇总

 result, number = re.subn(regex, newstring, subject) 

 reobj = re.compile(regex) result, number = reobj.subn(newstring, subject) 

 result = re.split(regex, subject) 

 reobj = re.compile(regex) result = reobj.split(subject) 

 regex=ur"..." #正则表达式 if re.search(regex, subject): do_something() else: do_anotherthing() 

 regex=ur"...\Z" #正则表达式末尾以\Z结束 if re.match(regex, subject): do_something() else: do_anotherthing() 

 regex=ur"..." #正则表达式 match = re.search(regex, subject) if match: # match start: match.start() # match end (exclusive): match.end() # matched text: match.group() do_something() else: do_anotherthing() 

 (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 = "" 

 (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 = "" 

 (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 = "" 

 (Get an array of all regex matches in a string) result = re.findall(regex, subject) 

 (Iterate over all matches in a string) for match in re.finditer(r"<(.*?)\s*.*?/\1>", subject) # match start: match.start() # match end (exclusive): match.end() # matched text: match.group() 

 (Create an object to use the same regex for many operations) reobj = re.compile(regex) 

 (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() 

 (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() 

 (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() 

 (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 = "" 

 (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 = "" 

 (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 = "" 

 (Use regex object to get an array of all regex matches in a string) reobj = re.compile(regex) result = reobj.findall(subject) 

 (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()