First Sentence Regex

Question

I\'m after a regex ( php / perl compatible ) to get the first sentence out of some text. I realize this could get huge if covering every case, but just after something that

Answer 1

This works in .NET:

/(?<=^\s*)(?!\s)("(\<'.*?'\>|.)*"|.)*?((?<='*"*)|[.?!]+|$)(?=\ \ |\n\n|$)/s

Handles quotation marks (American-style) (and quotes "like this 'and this.' Yes, with punctuation.") and sentences ending with multiple punctuations. Also ignores preceding whitespace. Requires two spaces or two end-of-lines or and end-of-file after sentences, though.

Handles the following well:

So much for Mr. Regex and his sentence matching, as he says "this sentence, isn't it wonderful? One says, 'It's almost as if this was crafted purely for example.'" This part shouldn't match, though.