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  1. //'main' method must be in a class 'Rextester'.
  2. //Compiler version 1.8.0_111
  3.  
  4. import java.util.*;
  5. import java.lang.*;
  6. import java.util.regex.Matcher;
  7. import java.util.regex.Pattern;
  8.  
  9. class Rextester
  10. {  
  11.     public static void main(String args[])
  12.     {
  13.         final String regex = "^(?:(0[1-9]|[1-9][0-9])0{6}|(0[1-9]|[1-9][0-9]){2}0{4}|((?:0[1-9]|[1-9][0-9])){3}00|(?:0[1-9]|[1-9][0-9]){4})$";
  14.         final String string = "00000000\n"
  15.              + "01000000\n"
  16.              + "10000000\n"
  17.              + "10440044\n"
  18.              + "99990000\n"
  19.              + "99999900\n"
  20.              + "99000099\n"
  21.              + "77007788\n"
  22.              + "55555555";
  23.  
  24.         final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
  25.         final Matcher matcher = pattern.matcher(string);
  26.  
  27.         while (matcher.find()) {
  28.             System.out.println("Full match: " + matcher.group(0));
  29.                 if (null != matcher.group(1)) {
  30.                     System.out.println("Level 1");
  31.                 } else if (null != matcher.group(2)) {
  32.                     System.out.println("Level 2");
  33.                 } else if (null != matcher.group(3)) {
  34.                     System.out.println("Level 3");
  35.                 } else {
  36.                     System.out.println("Level 4");
  37.                 }   
  38.         }
  39.     }
  40. }
Success #stdin #stdout 0.05s 2184192KB
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Standard input is empty
stdout
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Full match: 01000000
Level 1
Full match: 10000000
Level 1
Full match: 99990000
Level 2
Full match: 99999900
Level 3
Full match: 55555555
Level 4
https://ideone.com/GzMhKI
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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