Supports spaces in author filtering

src/main/java/net/knarcraft/bookswithoutborders/gui/BookIndex.java

@@ -48,6 +48,27 @@ public abstract class BookIndex {
                 return true;
             }
         }
+
+        // Parse book author from input
+        for (int i = 0; i < arguments.length; i++) {
+            String author = InputCleaningHelper.parseAuthorSpecifier(arguments[i]);
+            if (author == null) {
+                continue;
+            }
+            for (int j = i + 1; j < arguments.length; j++) {
+                int pageNumber = InputCleaningHelper.parsePageNumber(arguments[j]);
+                if (pageNumber > 0) {
+                    int authorEnd = j - 1;
+                    StringBuilder builder = new StringBuilder(author);
+                    for (int k = i + 1; k <= authorEnd; k++) {
+                        builder.append(" ").append(arguments[k]);
+                    }
+                    AuthorBookIndex.printBooks(sender, selectPublic, command, pageNumber, builder.toString());
+                    return true;
+                }
+            }
+        }
+
         return false;
     }
 

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

@@ -78,7 +78,7 @@ public final class InputCleaningHelper {
      */
     @Nullable
     public static String parseAuthorSpecifier(@NotNull String input) {
-        Pattern pattern = Pattern.compile("author([0-9a-zA-Z_]+)");
+        Pattern pattern = Pattern.compile("author([\\p{L}0-9_.,!#%&'`^@$+]+)");
         Matcher matcher = pattern.matcher(input);
         if (matcher.matches()) {
             return matcher.group(1);