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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.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. public static void main (String[] args) throws java.lang.Exception
  12. {
  13. String inField = "";
  14.  
  15. Pattern p = Pattern.compile("^(\\d*|\\s*)$");
  16. boolean isCorrect = p.matcher(inField).matches();
  17. System.out.println(isCorrect);
  18.  
  19. inField = " ";
  20. isCorrect = p.matcher(inField).matches();
  21. System.out.println(isCorrect);
  22.  
  23. inField = "12345";
  24. isCorrect = p.matcher(inField).matches();
  25. System.out.println(isCorrect);
  26.  
  27. inField = " 12345";
  28. isCorrect = p.matcher(inField).matches();
  29. System.out.println(isCorrect);
  30.  
  31. inField = " 12345 ";
  32. isCorrect = p.matcher(inField).matches();
  33. System.out.println(isCorrect);
  34.  
  35. }
  36. }
Success #stdin #stdout 0.1s 320512KB
stdin
Standard input is empty
stdout
true
true
true
false
false