introduce HtmlHelper::wrapNewlines

src/helpers/HtmlHelper.php

@@ -25,7 +25,7 @@ class HtmlHelper
      */
     public static function wrapNewlines($content, $tag = 'p', $htmlOptions = [])
     {
-        $filteredNewLinesContent = preg_replace('((\r?\n)(?:\r?\n))', '$2', $content);
+        $filteredNewLinesContent = preg_replace('/((\r?\n)(?:\r?\n))/', '$2', $content);
         $lines = preg_split('/\r?\n/', $filteredNewLinesContent);
 
         return implode("\n", array_map(function ($line) use ($tag, $htmlOptions) {