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This article mainly introduces the Python regular expression how to reverse reference grouping, 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.

1. The grouping content after regular expression matching can be accessed in the program diamante, and the grouping before being referenced within the regular expression can also be accessed.

2. The backreference syntax is the group number in the regular expression, and the group number starts at 1.

Example

Import re p = rust. Quote'# uses a backreference ① m = re.search (p, 'abc') print (m) # matches m = re.search (p,' abc') print (m) # mismatch

Output

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