Question

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What is a regular expression for parsing out individual sentences?

I want to split large text into sentence . The regex expression i got from answer here

string[] sentences = Regex.Split(mytext, @"(?<=[\.!\?])\s+");

So I thought of using a pattern to do splitting like
if a . ? ! follows a space and a capital letter than do the split.
Capital letter indicates starting of sentence .

text = " Sentence one . Sentence e.g. two ? Sentence three.
sentence[1] = Sentence one 
sentence[2] = Sentence e.g. two

For problematic cases like abbreviations i intend to do replacing

mytext.replace("e.g.","eg"); 

How to implement this in regex ?

Answer 1

\p{Lt} indicates a Unicode uppercase letter (including accents etc.), so

string[] sentences = Regex.Split(mytext, @"(?<=[.!?])\s+(?=\p{Lt})");

should do what you want.

(Note that I don’t think . or ? need to be escaped in a character class so I’ve removed them too, but do check that this still works with those characters.)

However, note that this will still split on e.g. Mr. Jones…