在Python中使用Regex进行句子细分

Question

I am writing a script to split the text into sentences with Python. However I am quite bad with writing more complex regular expressions.

There are 5 rules according to which I wish to split the sentences. I want to split sentences if they:

* end with "!"  or
* end with "?"  or
* end with "..."  or
* end with "." and the full stop is not followed by a number  or
* end with "." and the full stop is followed by a whitespace

What would be the regular expression for this for Python?

Answer 1

You can literally translate your five bullet points to a regular expression:

!|\?|\.{3}|\.\D|\.\s

Note that I'm simply creating an alternation consisting of five alternatives, each of which represents one of your bullet points:

• !
• \\?
• \\.{3}
• \\.\\D
• \\.\\s

Since the dot ( . ) and the question mark ( ? ) are special characters within a regular expression pattern, they need to be escaped by a backslash ( \\ ) to be treated as literals. The pipe ( | ) is the delimiting character between two alternatives.

Using the above regular expression, you can then split your text into sentences using re.split .