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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.  
  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 input = "abc //abc";
  13. 		if (!input.matches("(?!.*//)[A-Za-z0-9][A-Za-z0-9/ ]{0,18}[A-Za-z0-9]")) { 
  14. 			System.out.println("Not matching!");	
  15. 		}
  16. 	}
  17. }
Success #stdin #stdout 0.12s 320576KB
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stdin
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Standard input is empty
stdout
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Not matching!
https://ideone.com/cLiMRQ
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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