1.測試正則表達式是否匹配字符串的全部或部分

2.測試正則表達式是否匹配整個字符串

3.創建一個匹配對象，然后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)

4.獲取正則表達式所匹配的子串(Get the part of a string matched by the regex)

5. 獲取捕獲組所匹配的子串(Get the part of a string matched by a capturing group)

6. 獲取有名組所匹配的子串(Get the part of a string matched by a named group)

7. 將字符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.遍歷所有匹配的子串(Iterate over all matches in a string)

9.通過正則表達式字符串創建一個正則表達式對象(Create an object to use the same regex for many operations)

reobj = re.compile(regex)

10.用法１的正則表達式對象版本(use regex object for if/else branch whether (part of) a string can be matched)

11.用法２的正則表達式對象版本(use regex object for if/else branch whether a string can be matched entirely)

12.創建一個正則表達式對象，然后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)

13.用正則表達式對象獲取匹配子串(Use regex object to get the part of a string matched by the regex)

14.用正則表達式對象獲取捕獲組所匹配的子串(Use regex object to get the part of a string matched by a capturing group)

15.用正則表達式對象獲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)

16.用正則表達式對象獲取所有匹配子串并放入數組(Use regex object to get an array of all regex matches in a string)

reobj = re.compile(regex)

result = reobj.findall(subject)

17.通過正則表達式對象遍歷所有匹配子串(Use regex object to iterate over all matches in a string)

18.字符串替換

1).替換所有匹配的子串

#用newstring替換subject中所有與正則表達式regex匹配的子串

result = re.sub(regex, newstring, subject)

2).替換所有匹配的子串(使用正則表達式對象)

reobj = re.compile(regex)

result = reobj.sub(newstring, subject)

19.字符串拆分

1).字符串拆分

result = re.split(regex, subject)

2).字符串拆分(使用正則表示式對象)

reobj = re.compile(regex)

result = reobj.split(subject)

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