下面列出PythonRegex的幾種匹配用法:
1.測試Regex是否匹配字串的全部或部分
regex=ur"" #Regex if re.search(regex, subject): do_something() else: do_anotherthing()
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2.測試Regex是否匹配整個字串
regex=ur"/Z" #Regex末尾以/Z結束 if re.match(regex, subject): do_something() else: do_anotherthing()
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3.建立一個匹配對象,然後通過該對象獲得匹配細節(Create an object with details about how the regex matches (part of) a string)
regex=ur"" #Regex 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.擷取Regex所匹配的子串(Get the part of a string matched by the regex)
regex=ur"" #Regex match = re.search(regex, subject) if match: result = match.group() else: result = "" |
5. 擷取擷取的群組所匹配的子串(Get the part of a string matched by a capturing group)
regex=ur"" #Regex match = re.search(regex, subject) if match: result = match.group(1) else: result = "" |
6. 擷取有名組所匹配的子串(Get the part of a string matched by a named group)
regex=ur"" #Regex match = re.search(regex, subject) if match: result = match.group"groupname") else: result = "" |
7. 將字串中所有匹配的子串放入數組中(Get an array of all regex matches in a string)
result = re.findall(regex, subject) |
8.遍曆所有匹配的子串(Iterate over all matches in a string)
for match in re.finditer(r"<(.*?)/s*.*?//1>", subject) # match start: match.start() # match end (exclusive): atch.end() # matched text: match.group() |
9.通過Regex字串建立一個Regex對象(Create an object to use the same regex for many operations)
reobj = re.compile(regex) |
10.用法1的Regex對象版本(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Regex對象版本(use regex object for if/else branch whether a string can be matched entirely)
reobj = re.compile(r"/Z") #Regex末尾以/Z 結束 if reobj.match(subject): do_something() else: do_anotherthing()
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12.建立一個Regex對象,然後通過該對象獲得匹配細節(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Regex對象擷取匹配子串(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Regex對象擷取擷取的群組所匹配的子串(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Regex對象擷取有名組所匹配的子串(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Regex對象擷取所有匹配子串並放入數組(Use regex object to get an array of all regex matches in a string)
reobj = re.compile(regex) result = reobj.findall(subject) |
17.通過Regex對象遍曆所有匹配子串(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() |
字串替換
1.替換所有匹配的子串
#用newstring替換subject中所有與Regexregex匹配的子串 result = re.sub(regex, newstring, subject) |
2.替換所有匹配的子串(使用Regex對象)
reobj = re.compile(regex) result = reobj.sub(newstring, subject) |
字串拆分
1.字串拆分
result = re.split(regex, subject) |
2.字串拆分(使用正則表示式對象)
reobj = re.compile(regex)
result = reobj.split(subject)