从字符串中删除短语列表

Question

I have an array of phrases:

bannedWords = ['hi', 'hi you', 'hello', 'and you']

I want to take a sentence like "hi, how are tim and you doing" and get this:

", how are tim doing"

Exact case matching is OK - sorry, should have clarified.

Answer 1

Since you want to remove extra spaces as well, the regex below should work better:

s = "Hi, How are Tim and you doing"
bannedWords = ['hi', 'hi you', 'hello', 'and you']
for i in bannedWords: 
    s = re.sub(i + "\s*", '', s, flags = re.I)
print s
# ', How are Tim doing'

Answer 2

You can use re.sub with a flag to do this in a case insensitive manner.

import re

bannedWords = ['hi', 'hi you', 'hello', 'and you']
sentence = "Hi, how are Tim and you doing"

new_sentence = re.sub('|'.join(bannedWords) + r'\s+', '', sentence, flags=re.I)
# new_sentence: ", how are Tim doing"

Answer 3

With regex you can join words you want to remove with |. We also want to remove any multiple blankspace with one blankspace. This ensures we only do two operations.

import re

def remove_banned(s,words):
    pattern = '|'.join(words)
    s = re.sub(pattern, '', s, flags = re.I) # remove words
    s = re.sub('\s+', ' ', s, flags = re.I) # remove extra blank space'
    return s

bannedWords = ['hi', 'hi you', 'hello', 'and you']
s = "Hi, How are Tim and you doing"

print(remove_banned(s,bannedWords))

Returns:

, How are Tim doing