From 4feb24f1d55955c06dfb5a83b436ed24dac901bd Mon Sep 17 00:00:00 2001
From: Alex Lende <alex@lende.xyz>
Date: Mon, 13 Mar 2023 06:13:07 -0600
Subject: [PATCH] Fix kses filter for un-prettified filters (#49004)

* Fix kses filter for un-prettified filters

* Remove unnecessary backslash
---
 lib/experimental/kses.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/experimental/kses.php b/lib/experimental/kses.php
index a949cf8cc45da5..a79ef5dbdce42a 100644
--- a/lib/experimental/kses.php
+++ b/lib/experimental/kses.php
@@ -78,7 +78,7 @@ function gutenberg_override_core_kses_init_filters() {
  */
 function allow_filter_in_styles( $allow_css, $css_test_string ) {
 	if ( preg_match(
-		"/^filter: url\('#wp-duotone-[-a-zA-Z0-9]+'\) \!important$/",
+		"/^filter:\s*url\('#wp-duotone-[-a-zA-Z0-9]+'\) !important$/",
 		$css_test_string
 	) ) {
 		return true;