Parsing text, but keeping punctuation

Question

I'm using this little piece of code to go through some inputted text and extracting sentences separated by the markers:

NSCharacterSet *punctuation =
[NSCharacterSet characterSetWithCharactersInString:@".!?\n"];
NSArray *parts = [data componentsSeparatedByCharactersInSet:punctuation];

The issue is that the resulting array is stripped from the punctuation. How do i go about storing the data with the appropriate punctuation? If possible, i'd like keep sentences marked with a newline (\n) as they are.

For example, if I enter this:

This is a sentence. It is marked by a period. This sentence is not marked by one How do you do? I'm doing very good!

I'd like to get something like this:

This is a sentence.
It is marked by a period.
This sentence is not marked by one
How do you do?
I'm doing very good!

Answer 1

Hope this helps:

NSString *string = @"This is a sentence. It is marked by a period. This sentence is not marked by one How do you do? I'm doing very good!";
NSError *error = nil;
NSString *pattern = @"(\\.|,|!|\\?|\\n)\\s*";
NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:pattern
                                                                            options:0
                                                                              error:&error];
if (expression)
{
    NSArray *matches = [expression matchesInString:string
                                           options:0
                                             range:NSMakeRange(0, [string length])];
    NSLog(@"%@", matches);
    if ([matches count] > 0)
    {
        NSMutableArray *sentences = [[NSMutableArray alloc] initWithCapacity:[matches count]];
        NSUInteger sentenceStart = 0;
        for (NSTextCheckingResult *result in matches)
        {
            NSUInteger sentenceEnd = result.range.location + 1;
            [sentences addObject:[string substringWithRange:NSMakeRange(sentenceStart, sentenceEnd - sentenceStart)]];
            sentenceStart = sentenceEnd + (result.range.length - 1);
        }
        NSLog(@"%@", sentences);
    }
}
else
{
    NSLog(@"ERROR: %@", error);
}