Split string into sentences

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Parsing sentences is far from being a trivial task, even for latin languages like English. A naive approach like the one you outline in your question will fail often enough that it will prove useless in practice.

A better approach is to use a BreakIterator configured with the right Locale.

BreakIterator iterator = BreakIterator.getSentenceInstance(Locale.US);
String source = "This is a test. This is a T.L.A. test. Now with a Dr. in it.";
iterator.setText(source);
int start = iterator.first();
for (int end = iterator.next();
    end != BreakIterator.DONE;
    start = end, end = iterator.next()) {
  System.out.println(source.substring(start,end));
}

Yields the following result:

  1. This is a test.
  2. This is a T.L.A. test.
  3. Now with a Dr. in it.

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