Fixes some bugs

Fixes a problem in color parsing where a &# code would throw an exception.
Makes sure to remove non-numerical characters in plugin versions to prevent an exception.

src/main/java/net/knarcraft/knarlib/util/ColorHelper.java

@@ -79,13 +79,17 @@ public final class ColorHelper {
         }
         Pattern pattern;
         if (requireAmpersandInHexColors) {
-            pattern = Pattern.compile("(&#[a-fA-F0-9]{6})");
+            pattern = Pattern.compile("&(#[a-fA-F0-9]{6})");
         } else {
-            pattern = Pattern.compile("(&?#[a-fA-F0-9]{6})");
+            pattern = Pattern.compile("&?(#[a-fA-F0-9]{6})");
         }
         Matcher matcher = pattern.matcher(message);
         while (matcher.find()) {
-            message = message.replace(matcher.group(), "" + ChatColor.of(matcher.group()));
+            try {
+                message = message.replace(matcher.group(), "" + ChatColor.of(matcher.group()));
+            } catch (IllegalArgumentException ignored) {
+                //Something was matched that wasn't a proper color after all. Ignore it.
+            }
         }
         return message;
     }

src/main/java/net/knarcraft/knarlib/util/UpdateChecker.java

@@ -86,6 +86,8 @@ public final class UpdateChecker {
      * @return <p>True if the new version is higher than the old one</p>
      */
     public static boolean isVersionHigher(String oldVersion, String newVersion) {
+        oldVersion = removeNonNumericCharacters(oldVersion);
+        newVersion = removeNonNumericCharacters(newVersion);
         String[] oldVersionParts = oldVersion.split("\\.");
         String[] newVersionParts = newVersion.split("\\.");
         int versionLength = Math.max(oldVersionParts.length, newVersionParts.length);
@@ -99,4 +101,14 @@ public final class UpdateChecker {
         return false;
     }
 
+    /**
+     * Removes all characters except numbers and the "." character from the given version string
+     *
+     * @param versionString <p>The version string to clean</p>
+     * @return <p>The string with non-numeric characters replaced</p>
+     */
+    private static String removeNonNumericCharacters(String versionString) {
+        return versionString.replaceAll("[^0-9.]", "");
+    }
+
 }