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  1. import java.util.*;
  2. import java.util.stream.Collectors;
  3. import java.lang.*;
  4. import java.io.*;
  5. import java.util.regex.*;
  6.  
  7. class Ideone
  8. {
  9. 	public static void main (String[] args) throws java.lang.Exception
  10. 	{
  11. 		String s = "P=32 N=5 M=2 N=12 N=1 S=3";
  12. 		System.out.println(s.replaceAll("\\s*\\b(?!N=\\d)\\w+=\\d+", "").trim()); 
  13. 	}
  14. }
Success #stdin #stdout 0.08s 33952KB
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Standard input is empty
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N=5 N=12 N=1
https://ideone.com/fG8z3a
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
secret

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