Moved random generator to Util.java

Author: phikal

app/src/main/java/com/phikal/regex/Util.java

@@ -6,6 +6,9 @@
 import android.os.Vibrator;
 import android.preference.PreferenceManager;
 
+import java.security.SecureRandom;
+import java.util.Random;
+
 public class Util {
     public static final String // preference names
             GAME_MODE = "game_",
@@ -20,6 +23,8 @@ public class Util {
     public static final String[]
             CHARS = {"[", "]", "(", ")", ".", "*", "+", "?", "^", "|", "{", "}", "-", "\\"};
 
+    public final static Random rnd = new SecureRandom();
+
     private Util() {
     }