Python正则表达式没有给出所需的输出

Question

I'm scraping a site which contains the following string

"1 Year+ in Category"

or in some cases

"1 Year+ by user in Category

I want to separate the Year, Category and the User. I tried using regular split but it doesn't work in this case because there are two delimiters 'in' and 'by'. So, I used regex. It kinda works but not properly. Here is the snippet

dateandcat=re.split(r'.\s[in , by]',rightside[0])

rightside[0] contains date,category and user. It results in the following output:

['1 Year', 'n Movies']
['1 Year', 'y user', 'n TV shows']
['1 Year', 'y user', 'n TV shows']
['1 Year', 'n Movies']

I could just trim off first two characters in [1] and [2] but I want to fix the regex. Why is second character of 'in' and 'by' still showing? How do I fix this?

Answer 1

Try using:

import re

value = "1 Year+ in Category by User"

match = re.match(r"(\d+ \w+\+?) in (\w+)(?: by (\w+)*)?", value)
if match:
    print(match.groups())

Output:

('1 Year+', 'Category', 'User')

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You can use regex101 to learn more about that regex and others.