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  1. import java.util.*;
  2.  
  3. import java.util.regex.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		String regex = "(\\d+)\\.(\\d+)(?:\\.(\\d+))?";
  10. 		Pattern p = Pattern.compile(regex);
  11.  
  12. 		String s1="3.2.1";
  13. 		Matcher m1 = p.matcher(s1);
  14. 		String result1 = m1.replaceAll(x ->
  15. 			x.group(3) != null ? "OGNL_" + x.group(1) + "_" + x.group(2) + "_" + x.group(3) :
  16. 			  "OGNL_" + x.group(1) + "_" + x.group(2) );
  17. 		System.out.println(result1);
  18.  
  19. 		String s2="3.2";
  20. 		Matcher m2 = p.matcher(s2);
  21. 		String result2 = m2.replaceAll(x ->
  22. 			x.group(3) != null ? "OGNL_" + x.group(1) + "_" + x.group(2) + "_" + x.group(3) :
  23. 			  "OGNL_" + x.group(1) + "_" + x.group(2) );
  24. 		System.out.println(result2);
  25. 	}
  26. }
Success #stdin #stdout 0.23s 38220KB
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Standard input is empty
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OGNL_3_2_1
OGNL_3_2
https://ideone.com/M7T3l3
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

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