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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.Matcher;
  5. import java.util.regex.Pattern;
  6.  
  7. class Ideone
  8. {
  9. 	public static void main (String[] args) throws java.lang.Exception
  10. 	{
  11. 		String regex = "^(?:(?:Fwd|Re)\\h*:\\h*)+";
  12. 		String string = "Fwd : Re : Re: Many\n"
  13. 			 + "Re : Re: Many\n"
  14. 			 + "Re:    Re: Many\n"
  15. 			 + "Re: Many\n"
  16. 			 + "Re: Many\n"
  17. 			 + "RE: Presidential Ballots for Florida\n"
  18. 			 + "RE: (no subject)\n"
  19. 			 + "Request - should not match anything\n"
  20. 			 + "this is the subject\n"
  21. 			 + "Re: Fwd";
  22.  
  23. 		Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE);
  24. 		Matcher matcher = pattern.matcher(string);
  25. 		String result = matcher.replaceAll("");
  26.  
  27. 		System.out.println(result);
  28. 	}
  29. }
Success #stdin #stdout 0.09s 33892KB
comments ()
stdin
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Standard input is empty
stdout
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Many
Many
Many
Many
Many
Presidential Ballots for Florida
(no subject)
Request - should not match anything
this is the subject
Fwd
https://ideone.com/EWt7nS
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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