diff --git a/classes/filters.php b/classes/filters.php
index a68edaa..a014550 100644
--- a/classes/filters.php
+++ b/classes/filters.php
@@ -48,7 +48,20 @@ class Filters {
         }
         foreach ( self::$filters as $pattern ) {
             if ( $pattern['enabled'] || false !== $force ) {
-                $data = trim( preg_replace( $pattern['match'], $pattern['replace'], $data ) );
+                if ( ! empty( $pattern['callback'] ) && is_array( $pattern['callback'] ) ) {
+                    $result = preg_replace_callback(
+                        $pattern['match'],
+                        $pattern['callback'],
+                        $data
+                    );
+                } else {
+                    $result = preg_replace(
+                        $pattern['match'],
+                        $pattern['replace'],
+                        $data
+                    );
+                }
+                $data = trim( $result );
             }
         }
         return $data;
@@ -59,13 +72,20 @@ class Filters {
             return $data;
         }
         if ( self::$filters[$name]['enabled'] || false !== $force ) {
-            $data = trim(
-                preg_replace(
+            if ( ! empty( self::$filters[$name]['callback'] ) && is_array( self::$filters[$name]['callback'] ) ) {
+                $result = preg_replace_callback(
+                    self::$filters[$name]['match'],
+                    self::$filters[$name]['callback'],
+                    $data
+                );
+            } else {
+                $result = preg_replace(
                     self::$filters[$name]['match'],
                     self::$filters[$name]['replace'],
                     $data
-                )
-            );
+                );
+            }
+            $data = trim( $result );
         }
         return $data;
     }
@@ -78,12 +98,21 @@ class Filters {
      * @param {string} [$replace]
      * @param {bool} [$enabled] - Whether the filter should be enabled or disabled.
      */
-    public static function add( $filterName, $match, $replace, $enabled = false ) {
+    public static function add( $filterName, $match, $replace, $enabled = false, $callback = false ) {
         if ( isset( self::$filters[$filterName] ) ) {
             Debug::error( "Filter already exists: $filterName" );
             return;
         }
-        self::$filters[$filterName] = [
+        if ( $callback === true ) {
+            self::$filters[ $filterName ] = [
+                'name' => $filterName,
+                'match' => $match,
+                'callback' => $replace,
+                'enabled' => $enabled,
+            ];
+            return;
+        }
+        self::$filters[ $filterName ] = [
             'name' => $filterName,
             'match' => $match,
             'replace' => $replace,