BBCode - optimized preg escaping of searchstring

src/Content/Text/BBCode.php

@@ -1363,7 +1363,7 @@ class BBCode extends BaseObject
 
 		// We need no target="_blank" for local links
 		// convert links start with System::baseUrl() as local link without the target="_blank" attribute
-		$escapedBaseUrl = str_replace('://', '\:\/\/', System::baseUrl());
+		$escapedBaseUrl = preg_quote(System::baseUrl(), '/');
 		$text = preg_replace("/\[url\]($escapedBaseUrl)([$URLSearchString]*)\[\/url\]/ism", '<a href="$1$2">$1$2</a>', $text);
 		$text = preg_replace("/\[url\=($escapedBaseUrl)([$URLSearchString]*)\](.*?)\[\/url\]/ism", '<a href="$1$2">$3</a>', $text);