81831

Separate Full Sentences in a block of NSString text

I have been trying to use Regular Expression to separate full sentences in a big block of text. I can't use the componentsSeparatedByCharactersInSet because it will obviously fail with sentences ending in ?!, !!, ... I have seen some external classes to do componentSeparateByRegEx but I prefer doing it without adding an external library.

Here is a sample input <strong>Hi, I am testing. How are you? Wow!! this is the best, and I am happy.</strong>

The output should be an array

first element: <strong>Hi, I am testing.</strong>

second element: <strong>How are you?</strong>

third element: <strong>wow!!</strong>

forth element: <strong>this is the best, and I am happy.</strong>

This is what I have but as I mentioned it shouldn't do what I intend. Probably a regular expression will do a much better job here.

-(NSArray *)getArrayOfFullSentencesFromBlockOfText:(NSString *)textBlock{ NSMutableCharacterSet *characterSet = [[NSMutableCharacterSet alloc] init]; [characterSet addCharactersInString:@".?!"]; NSArray * sentenceArray = [textBlock componentsSeparatedByCharactersInSet:characterSet]; return sentenceArray; }

Thanks for your help,

Answer1:

You want to use -[NSString enumerateSubstringsInRange:options:usingBlock:] with the NSStringEnumerationBySentences option. This will give you every sentence, and it does so in a language-aware manner.

NSArray *fullSentencesFromText(NSString *text) { NSMutableArray *results = [NSMutableArray array]; [text enumerateSubstringsInRange:NSMakeRange(0, [text length]) options:NSStringEnumerationBySentences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { [results addObject:substring]; }]; return results; }

Note, in testing, each substring appears to contain the trailing spaces after the punctuation. You may want to strip those out.

Answer2:

Something like this could do the job:

NSString *msg = @"Hi, I am testing. How are you? Wow!! this is the best, and I am happy."; [msg enumerateSubstringsInRange:NSMakeRange(0, [msg length]) options:NSStringEnumerationBySentences | NSStringEnumerationLocalized usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { NSLog(@"Sentence:%@", substring); // Add each sentence into an array }];

Answer3:

Or use:

[mutstri enumerateSubstringsInRange:NSMakeRange(0, [mutstri length]) options:NSStringEnumerationBySentences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){ NSLog(@"%@", substring); }];

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