[5.3] Allow email addresses with an underscore (joomla#45102)

Author: charvimehradu

plugins/content/emailcloak/src/Extension/EmailCloak.php

@@ -160,7 +160,7 @@ private function cloak($text)
         $mode = $mode === 1;
 
         // Example: [email protected]
-        $searchEmail = "([\p{L}\p{N}\.\'\-\+]+\@(?:[\.\-\p{L}\p{N}]+\.)+(?:[\-\p{L}\p{N}]{2,24}))";
+        $searchEmail = "([\p{L}\p{N}\.\'\-\+\_]+\@(?:[\.\-\p{L}\p{N}]+\.)+(?:[\-\p{L}\p{N}]{2,24}))";
 
         // Example: [email protected]?subject=anyText
         $searchEmailLink = $searchEmail . '([?&][\x20-\x7f][^"<>]+)';