正则表达式可以找到包含单词的句子中的所有内容

Question

I am trying to figure out how to find the sentence containing a certain word so lets say the word is 'wow' then in the three following strings

\\nOkay hold on. This is pretty wow in here. Okay.\\n

\\nThis is super wow. Doesn't get much more wow than that.\\n

\\nHold up. wow.\\n

\\nOkay wow. Just wow!\\n

would yield the following respectively:

This is pretty wow in here

This is super wow.

wow.

Okay wow.

I am doing this in Python3 so I have the luxury of writing if statements but it is messy and I am hoping to avoid doing so. Here is my code for what was working but started failing. Maybe I am just too bad at Regex and am over complicating this.

    m = re.search('(?:(\.\s[A-Z]))(?=(.*)' + name+ '([^a-z^A-Z]))([^.]*)(\.\s[A-Z])', node.getIntroText())
    if m == None:
        m = re.search('(?:(\.\s[A-Z]))(?=(.*)' + name+ '([^a-z^A-Z]))(.*)(\.\s[A-Z])', node.getIntroText())
    if m == None:
        m = re.search('(?:([\r\n]))(?=(.*)' + name+ '([^a-z^A-Z]))([^.]*)(\.\s[A-Z])', node.getIntroText())

Essentially I want to capture the (first period or newline) instance before 'name' all the way to the next instance of a period followed by a (space and anything but a letter) or a new line.

Answer 1

Converting my comment to answer. You may use this regex

>>> reg = re.compile(r"^(?:(?:(?!\bwow\b)[^.\n])*\. +)*((?:[a-z][^.\n]*?)?\bwow\b[^.\n]*)(?=\.)", re.MULTILINE | re.IGNORECASE)
>>> test_str = ("\n"
...     "Okay hold on. This is pretty wow in here. Okay.\n\n"
...     "This is super wow. Doesn't get much more wow than that.\n\n"
...     "Hold up. wow.\n\n"
...     "Okay wow. Just Wow!\n")
>>> print ( reg.findall(test_str) )

['This is pretty wow in here', 'This is super wow', 'wow', 'Okay wow']

RegEx Demo

RegEx Explanation:

• ^ : Start
• (?:(?:(?!\\bwow\\b)[^.\\n])*\\. +)* : Match 0 or more sentences that don't contain wow .
• ((?:[az][^.\\n]*?)?\\bwow\\b[^.\\n]*) : Match a sentence containing word wow
• (?=\\.) : Assert that we have dot at next position
• Modes re.MULTILINE | re.IGNORECASE re.MULTILINE | re.IGNORECASE are for multiline and ignore-case

Answer 2

Calling re.replace() makes life simple:

wowSentence = re.sub('.*?(?:^|\. *)([^.]*\bwow\b[^.]*).*', '$1', paragraph)

See live demo .

Add (?i) to the front of the regex to match wow case insensitively.