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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. import java.util.regex.*;
  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 regexp = "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
  13. 		String goodIp = "192.168.0.3";
  14. 		String badIp = "192.168.0.3g";
  15. 		Pattern pattern = Pattern.compile(regexp);
  16. 		Matcher matcher = pattern.matcher(goodIp);
  17. 		String teg1 = "";
  18. 		String teg2 = "";
  19. 		if (matcher.find())
  20. 		{
  21. 			teg1 = matcher.group();
  22. 			System.out.println(teg1);
  23. 		}
  24. 		matcher = pattern.matcher(badIp);
  25. 		if (matcher.find())
  26. 		{
  27. 			teg2 = matcher.group();
  28. 			System.out.println(teg2);
  29. 		}
  30.  
  31.  
  32. 	}
  33. }
Success #stdin #stdout 0.11s 321600KB
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stdin
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Standard input is empty
stdout
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192.168.0.3
192.168.0.3
https://ideone.com/gvL4sB
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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