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This article mainly introduces the python regular expression how to achieve grouping naming, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Group naming

Format:

(P regular expression)

Note: P, the title number of the English book is the name of the group.

Use:

Group naming names different groups when there are many segments, which is easy to use and prevents confusion.

Case study:

Str1 = 'study python every day'ret = re.search (' (?), str1) print (ret) print (ret.group ('tag')) print (ret.group (' name')) out:tagstudy python every day

The above case is a simple demonstration, with only two groups. But the actual crawler will often encounter more than 10 groups. It is easy to confuse the data when there are a large number of groups. it is very convenient to use grouping naming to read the corresponding data according to the name, which improves the readability of the code.

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