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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.regex.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11.  
  12. 	public static String limiter(String str, int lim) {
  13. 		str = str.trim().replaceAll(" +", " ");
  14. 		str = str.replaceAll("\n +", "\n");
  15. 		Matcher mtr = Pattern.compile("(?U)(.{1," + lim + "}\\b\\s*)|(.{0," + lim + "})").matcher(str);
  16. 		String newStr = "";
  17. 		int ctr = 0;
  18. 		while (mtr.find()) {
  19. 			if (ctr == 0) {
  20. 				newStr += mtr.group();
  21. 				ctr++;
  22. 			} else {
  23. 				newStr += "\n" + mtr.group();
  24. 			}
  25. 		}
  26. 		return newStr;
  27. 	}
  28.  
  29. 	public static void main (String[] args) throws java.lang.Exception
  30. 	{
  31. 		// your code goes here
  32. 		int limit = 7;
  33. 		String str = "     The   123456789  456789 +-.,!@#$%^&*();\\/|<>\"\'  fox     jumpeded     over the uf\n 2   3456 green     fence     ";
  34. 		String result = limiter(str, limit);
  35. 		System.out.print(result);
  36. 	}
  37. }
Success #stdin #stdout 0.11s 321600KB
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stdin
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Standard input is empty
stdout
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The 
1234567
89 
456789 
+-.,!@#
$%^&*()
;\/|<>"
' fox 
jumpede
d over 
the uf

2 3456 
green 
fence
https://ideone.com/NHlbLf
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
secret

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