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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		String text = "A1../D//FASDFAS--DFASD//.F";
  10. 		System.out.println(text.replaceAll("(\\G(?!^|(?:\\p{Alnum}\\P{Alnum}*){2}$)|^(?:\\P{Alnum}*\\p{Alnum}){5}).", "$1*"));
  11. 	}
  12. }
Success #stdin #stdout 0.08s 34052KB
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Standard input is empty
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A1../D//FA***********D//.F
https://ideone.com/bMboTX
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
secret

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