如何使用 Python 中的正则表达式删除以“@”开头并以空白字符结尾的字符串？

Question

So I have this text:

"@Natalija What a wonderful day, isn't it @Kristina123?"

I tried to remove these two substrings that start with the character '@' by using re.sub function but it didn't work.

How do I remove the susbstring that starts with this character?

Answer 1

Try this regex:

import re
text = "@Natalija What a wonderful day, isn't it @Kristina123 ?"
t = re.sub('@.*? ', '', text)
print(t)

OUTPUT:

What a wonderful day, isn't it ?

Answer 2

This should work.

• @ matches the character @
• \w+ matches any word character as many times as possible, so it stops at blank character

Code:

import re

regex = r"@\w+"
subst = "XXX"

test_str = "@Natalija What a wonderful day, isn't it @Kristina123 ?"
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

print (result)

output:

XXX What a wonderful day, isn't it XXX ?

Answer 3

It's possible to do it with re.sub() , it would be something like this:

import re

text = "@Natalija What a wonderful day, isn't it @Kristina123 ?"

output = re.sub('@[a-zA-Z0-9]+\s','',text)

print(output) # Output: What a wonderful day, isn't it ?

• @ matches the @ character
• [a-zA-Z0-9] matches alphanumerical (uppercase and lowercase)
• "+" means "one or more" (otherwise it would match only one of those characters)
• \s matches whitespaces

Answer 4

Alternatively, this can also be done without using the module re. You can first split the sentence into words. Then remove the words containing the @ character and finally join the words into a new sentence.

if __name__ == '__main__':
    original_text = "@Natalija What a wonderful day, isn't it @Kristina123 ?"
    individual_words = original_text.split(' ')

    words_without_tags = [word for word in individual_words if '@' not in word]

    new_sentence = ' '.join(words_without_tags)
    print(new_sentence)

Answer 5

I think this would be work for you. The pattern @\w+?\s will determine expressions which start with @ continued by one or more alphanumeric characters then finish with an optional white space.

import re

string = "@Natalija What a wonderful day, isn't it @Kristina123 ?"
pattern = '@\w+?\s'

replaced = re.sub(pattern, '', string)
print(replaced)