import re
def delete_boring_characters(sentence):
return re.sub('[0-9’!"#$%&\'()*+,-./:;<=>?@,。?★、…【】《》?“”‘’![\\]^_`{|}~\s]+', "", sentence)
if __name__ == '__main__':
clean_str = delete_boring_characters('[Helloworld!!!!]')
print(clean_str) # Helloworld