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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String email = "any_email@provider.whatever"; 
  13. 		String masked = email.replaceAll("(?<=^.|@.)(?<toreplace>[^@]*?)(?=.@|.$)", "***");
  14. 		System.out.println(masked); 
  15. 	}
  16. }
Success #stdin #stdout 0.1s 320512KB
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Standard input is empty
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a***l@p***r
https://ideone.com/PeRvy1
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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