What is the findall function in python regular expressions?

In this article, let’s learn about the relevant knowledge about python regular expressions. Some friends may have just come into contact with the python programming language and do not have a special understanding of this aspect. In the next article, we will take you to learn about the python findall function in regular expressions.

Summary

Find all substrings matched by the regular expression in the string and return a list. If no match is found, an empty list is returned.

(Note: match and search match once and findall matches all.)

The syntax format is:

findall(string[, pos[, endpos]])

Parameters

string : The string to be matched.

pos: Optional parameter, specifying the starting position of the string, the default is 0.

endpos: Optional parameter, specifying the end position of the string, defaulting to the length of the string.

For example, find all the numbers in the string:

# -*- coding:UTF8 -*-
 
import re
 
pattern = re.compile(r'\d+')   # 查找数字
result1 = pattern.findall('runoob 123 google 456')
result2 = pattern.findall('run88oob123google456', 0, 10)
 
print(result1)
print(result2)

Output result:

['123', '456']
['88', '12']

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