与 findall() 一起使用的正则表达式模式以定位 3 个字母的单词

Question

So I have some code that produces the right result, but the code is too specific. I want it more generic so that I can use re.findall() to extract all 3 letter words from 's2' (for example, DOG).

In the below code, the problem is that I am cherry-picking the three words that are 3 letter words when I print m[0:3]. In other words, the code I have looks for 3+ letter words and I have to cherry-pick, whereas I just want 3 letters words--no more, no less from the get-go.

list2 = 'A, k: it; hi! map@ LAP# rAp, home: LIFE; party! animals@'
m = re.findall(r'(\w{3,})', list2) 
m[0:3]

I want to get ['map', 'lap', 'rAP']. And I want for the code to have ability to retain any other 3, no more no less, letter words in the future.

Answer 1

You can look for exactly three word characters, surrounded by word boundaries:

import re

s2 = 'I, a: be; go! cat@ DOG# aRe, home: WORK; ninja! rules@'
m = re.findall(r'\b\w{3}\b', s2) 
print(m)
# ['cat', 'DOG', 'aRe']