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This article mainly introduces "what is the re.match function syntax of Python3". In daily operation, I believe that many people have doubts about the syntax of Python3 re.match function. The editor has consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "what is the re.match function syntax of Python3?" Next, please follow the editor to study!

A regular expression is a special sequence of characters that helps you easily check whether a string matches a pattern.

Python has added the re module since version 1.5, which provides Perl-style regular expression patterns.

The re module enables the Python language to have all the regular expression functions.

The compile function generates a regular expression object based on a pattern string and optional flag parameters. The object has a series of methods for regular expression matching and replacement.

The re module also provides functions that are exactly the same as those of these methods, which take a pattern string as their first argument.

Re.match function

Re.match attempts to match a pattern from the beginning of the string, and match () returns none if the match is not successful.

Function syntax:

Re.match (pattern, string, flags=0)

Function parameter description:

Parameter describes the string to be matched by the regular expression string that pattern matches. Flags flag bit, which is used to control how regular expressions are matched, such as case sensitivity, multi-line matching, and so on.

If the match succeeds, the re.match method returns a matching object, otherwise it returns None.

We can use the group (num) or groups () match object function to get the matching expression.

The match object method describes the string of the entire expression that group (num=0) matches, and group () can enter more than one group number at a time, in which case it returns a tuple containing the values corresponding to those groups. Groups () returns a tuple containing all the team strings, from 1 to the contained group number. At this point, the study of "what is the syntax of the re.match function of Python3" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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