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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.*;
  5.  
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{
  10. 		String s = "sample_filename_AB12123321.pdf";
  11. 		Pattern pattern = Pattern.compile("(?<=_)[^_]{2}(?=[^_]*$)");
  12. 		Matcher matcher = pattern.matcher(s);
  13. 		if (matcher.find()){
  14. 		    System.out.println(matcher.group(0)); 
  15. 		} 
  16. 	}
  17. }
Success #stdin #stdout 0.07s 33768KB
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stdin 
Standard input is empty
stdout 
AB
https://ideone.com/MfjwF0
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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