python中的正则表达式，替换单词中除#hashtag和@username之外的所有元音

Question

I'm trying to learn regex in python to replace all vowels in word except #hashtag and @username. but I only know regex for:

find vowels: [aiueoAIUEO]

find @username and #hashtag: ([@#][\\w_-]+)

example:

@username blah blah #blah blah #hashtag @blah blah blah

become:

@username blh blh #blah blh #hashtag @blah blh blh

import re

s = "@username blah blah #blah blah #hashtag @blah blah blah"

#([@#][\w_-]+)
print(re.sub(r'[aiueoAIUEO]', '', s))

Answer 1

You may use

import re
s = "@username blah blah #blah blah #hashtag @blah blah blah"
print(re.sub(r'([@#][\w-]+)|[aiueoAIUEO]', r'\1', s))

See the regex demo and the Python demo .

With ([@#][\\w-]+)|[aiueoAIUEO] , the hashtag/mention gets captured into Group 1, and in that case, \\1 backreference puts it back into the resulting string, else a vowel is matched and removed.