使用RE查找单词的匹配项

Question

I'm trying to check if string contains specific words in a specific pattern, ignore case sensitive and ignore the order. How can I do it in regular expression?

This is the pattern I want:

'word1-word2'

These strings should match:

['WORD1-word2','word2-word1']

These strings shouldn't match:

['word3-word2','word1word2']

Answer 1

也许像这样：

((?:word|WORD)[1-2]-(?:word|WORD)[1-2])

Answer 2

re.match("word1-word2|word2-word1", "WORD1-word2", re.IGNORECASE)

Answer 3

Use anchors:

import re

words = ['WORD1-word2','word2-word1', 'word3-word2','word1word2']

rx = re.compile(r'^(?:word1-word2)|(?:word2-word1)$', re.I)

words_new = list(filter(lambda x: rx.search(x), words))
print(words_new)