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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
comments (?)
stdin
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Standard input is empty
stdout
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true
true
true
false
false
https://ideone.com/hwj5iV
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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