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This article mainly introduces python how to use re.DEBUG to view the regular expression matching process, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Use re.DEBUG to view the matching process of regular expressions

Regular expressions are a feature of Python, but it can be painful to debug and it's easy to get a bug. Fortunately, Python can print out a parsing tree of regular expressions and use re.debug to show the complete process of re.compile.

Once you understand the grammar, you can find your mistakes. Here we can see that [/ font] forgot to remove []

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