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  1. import java.util.regex.*;
  2.  
  3.  
  4. public class Main
  5. {
  6.   public static void main(String[] args) throws Exception
  7.   {
  8.     Pattern p = Pattern.compile(
  9.         "^/exec\\?(?:(?:(?!\\1)command=shutdown()|(?!command\\b)\\w+(?:=[^&]+)?)(?:&|$))+$\\1"
  10.     );
  11.     Matcher m = p.matcher("");
  12.  
  13.     String[] inputs = {
  14.         "/exec?debug=true&command=shutdown&f=0",
  15.         "/exec?commando=yes&zcommand=34&command=shutdown&p",
  16.         "/exec?version=0.4&command=shutdown&out=JSON&zcommand=1",
  17.         "/exec?command=shutdown&out=JSON",
  18.         "/exec?version=0.4&command=startup&out=JSON&zcommand=1&commando=shutdown",
  19.         "/exec?version=0.4&command=admin&out=JSON&zcommand=1&command=shutdown",
  20.         "/exec?version=0.4&command=shutdown&out=JSON&zcommand=1&command=shutdown"
  21.     };
  22.  
  23.     for (String s : inputs)
  24.     {
  25.       System.out.printf( "%n%s%n=>%s%n", s, m.reset(s).find() );
  26.     }
  27.   }
  28. }
Success #stdin #stdout 0.04s 245632KB
comments (?)
stdin 
Standard input is empty
stdout 
/exec?debug=true&command=shutdown&f=0
=>true

/exec?commando=yes&zcommand=34&command=shutdown&p
=>true

/exec?version=0.4&command=shutdown&out=JSON&zcommand=1
=>true

/exec?command=shutdown&out=JSON
=>true

/exec?version=0.4&command=startup&out=JSON&zcommand=1&commando=shutdown
=>false

/exec?version=0.4&command=admin&out=JSON&zcommand=1&command=shutdown
=>false

/exec?version=0.4&command=shutdown&out=JSON&zcommand=1&command=shutdown
=>false
https://ideone.com/tJddy
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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