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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main {
  5. 	public static void main (String[] args) throws java.lang.Exception {
  6.     	String str = "hello, this is a long sentence";
  7. 		System.out.printf("Replaced: [%s]%n", truncateAfteWords(3, str));		
  8. 	}
  9.  
  10.     private static String truncateAfteWords(int n, String str) {
  11. 		return str.replaceAll("^((?:\\W*\\w+){" + n + "}).*$", "$1");	
  12. 	}  
  13. }
Success #stdin #stdout 0.08s 380160KB
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Standard input is empty
stdout
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Replaced: [hello, this is]
https://ideone.com/Nsojc7
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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