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  1. import java.util.regex.*;
  2.  
  3. class Ideone {
  4.   public static void main (String[] args) throws java.lang.Exception {
  5.     Pattern p = Pattern.compile("(.)(?=((?!\\1).)*\\1(?!.*\\1))");
  6.  
  7.     for (Matcher m = p.matcher("abacaba dx xyzzzyy"); m.find(); ) {
  8.       System.out.print(m.group());
  9.     }
  10.   }
  11. }
Success #stdin #stdout 0.1s 27780KB
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Standard input is empty
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ba xzy
https://ideone.com/UimHaP
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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