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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.*;
  5.  
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{
  10. 		String str = "hello   hello world world world world";
  11. 		String pat = "\\b(\\w+)(?:\\s+\\1\\b)+";
  12. 		String res = str.replaceAll(pat, "$1");
  13. 		System.out.println(res);
  14. 	}
  15. }
Success #stdin #stdout 0.05s 4386816KB
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stdin
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Standard input is empty
stdout
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hello world
https://ideone.com/tD0x7g
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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