Detailed explanation of python's regular re module
Introduction
update time：2018-01-10The function prototype of re.match is: re.match(pattern, string, flags)
The first parameter is a regular expression, here it is "(\w )\s". If the match is successful, a Match is returned, otherwise a None is returned;
The second parameter represents the string to be matched;
The third parameter is the Peugeot bit, which is used to control the matching method of regular expressions, such as: whether to be case-sensitive, multi-line matching, etc.
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