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Lesson 1: use the match method to match the string # regular expression: use the match method to match the string 'regular expression: is used to process text, abstracting a similar set of strings The resulting text pattern string windows dir *. Txt file1.txt file2.txt abc.txt test.doca-file1.txt-blinux/mac ls is mainly used to learn five aspects of regular expressions. 1. Match: detect whether a string matches a regular expression. 2. Search: search for substrings that match regular expressions in a long string. Findall: find strings 4. Sub and subn: search and replace 5 .split: specify delimiters through regular expressions Use this separator to split the import re # into the regular expression module's m = re.match ('hello',' hello') # the first string that specifies the regular expression The second string that represents the string to be matched can actually be a simple string print (m) # print (m. Regular expressions. Regular expressions _) # look at the type of m Matchprint (type (m)) # m = re.match ('hello') 'world') if m is not None: print (' match succeeded') else: print ('match not successful') # regular expression if the string to be matched is included If m = re.match ('hello',' world hello') print (m) # None does not match, the return value is None#. The prefix of the string to be matched can match the regular expression. The system also thinks it is a match m = re.match ('hello',' hello world') print (m) #-lesson 2 uses the search function to find a substring in a string the difference between the search function and the match function is The string in the search function can be matched, and the match function must be prefixed to match the regular expression. The system also thinks that import rem = re.match ('python',' I love python.') if m is not None: print (m.group ()) # the method to call group is returned to a group print (m) # Nonem = re.search ('python',' I love python.') if m is not None: print (m.group ()) print (m) # # python# span= (7) 13) indicates that python is in'I love python.' The position in the string is left closed and right open.

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