add Splitter.retainDelimiters() to retain delimiter after spliting

[gissuebot]

Original issue created by anthony.musyoki on 2013-04-23 at 01:28 PM

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It would be good if a splitter could be configured to retain the delimiter in the returned iterable

Thus

Splitter splitter = Splitter.on(CharMatcher.DIGIT).trimResults().retainDelimiter();
String input = "1 one 2 two 3 three 50 fifty";
Iterable<String> output = splitter.split(input);

should yield
[1,one,2,two,3,three,50,fifty]

[gissuebot]

Original comment posted by lowasser@google.com on 2013-05-03 at 09:20 PM

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So you're suggesting the delimiters should be their own groupings? This particular example could equally well be written as Splitter.on(CharMatcher.WHITESPACE).omitEmptyStrings() and would get the same result.

[gissuebot]

Original comment posted by anthony.musyoki on 2013-05-06 at 08:13 PM

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In the above case that would work but am sure you are aware in many other cases it wouldn't be that simple.

[JanecekPetr]

e.g. http://stackoverflow.com/questions/30877790/guava-splitter-for-splitting-on-space-special-character-digit and/or any other splittings where a lookahead/lookbehind is needed otherwise