python - 用不同的词替换每个匹配项

Question

我有一个像这样的正则表达式:

findthe = re.compile(r" the ")
replacement = ["firstthe", "secondthe"]
sentence = "This is the first sentence in the whole universe!"

我想做的是用列表中的关联替换词替换每个出现的地方，这样结尾的句子看起来像这样:

>>> print sentence
This is firstthe first sentence in secondthe whole universe

我尝试在 for 循环中使用 re.sub 来枚举替换，但它看起来像 re.sub 返回所有出现的地方。谁能告诉我如何有效地做到这一点？

Answer 1

如果不需要使用正则表达式，可以尝试使用以下代码:

replacement = ["firstthe", "secondthe"]
sentence = "This is the first sentence in the whole universe!"

words = sentence.split()

counter = 0
for i,word in enumerate(words):
    if word == 'the':
        words[i] = replacement[counter]
        counter += 1

sentence = ' '.join(words)

或者像这样的东西也可以:

import re
findthe = re.compile(r"\b(the)\b")
print re.sub(findthe, replacement[1],re.sub(findthe, replacement[0],sentence, 1), 1)

至少:

re.sub(findthe, lambda matchObj: replacement.pop(0),sentence)