Adds book reloading, and fixes a RegEx expression

src/main/java/net/knarcraft/bookswithoutborders/BooksWithoutBorders.java

@@ -139,6 +139,14 @@ public class BooksWithoutBorders extends JavaPlugin {
         }
     }
 
+    /**
+     * Clears book data such as per-player lists and per-player character indexes
+     */
+    public static void clearBookData() {
+        playerBooksList = new HashMap<>();
+        playerLetterIndex = new HashMap<>();
+    }
+
 
     @Override
     public void onEnable() {

src/main/java/net/knarcraft/bookswithoutborders/command/CommandReload.java

@@ -23,6 +23,10 @@ public class CommandReload implements TabExecutor {
             BooksWithoutBorders.sendErrorMessage(sender, "Reload Failed!");
             BooksWithoutBorders.sendErrorMessage(sender, "See console for details");
         }
+
+        // Reload books
+        BooksWithoutBorders.updateBooks(sender, true);
+        BooksWithoutBorders.clearBookData();
         return true;
     }
 

src/main/java/net/knarcraft/bookswithoutborders/utility/InputCleaningHelper.java

@@ -75,7 +75,7 @@ public final class InputCleaningHelper {
      */
     public static int parsePageNumber(@NotNull String input) {
         try {
-            Pattern pattern = Pattern.compile("page([0-9])+");
+            Pattern pattern = Pattern.compile("page([0-9]+)");
             Matcher matcher = pattern.matcher(input);
             if (matcher.matches()) {
                 return Integer.parseInt(matcher.group(1));