Issue #3239294 by alexpott, daffie, andypost: Passing NULL to the limit...

Issue #3239294 by alexpott, daffie, andypost: Passing NULL to the limit argument of preg_split triggers a deprecation in PHP 8.1

core/lib/Drupal/Core/Routing/RouteProvider.php

@@ -349,7 +349,7 @@ protected function getRoutesByPath($path) {
     // have a case-insensitive match from the incoming path to the lower case
     // pattern outlines from \Drupal\Core\Routing\RouteCompiler::compile().
     // @see \Drupal\Core\Routing\CompiledRoute::__construct()
-    $parts = preg_split('@/+@', mb_strtolower($path), NULL, PREG_SPLIT_NO_EMPTY);
+    $parts = preg_split('@/+@', mb_strtolower($path), -1, PREG_SPLIT_NO_EMPTY);
 
     $collection = new RouteCollection();
 

core/modules/search/search.module

@@ -506,7 +506,7 @@ function _search_find_match_with_simplify($key, $text, $boundary, $langcode = NU
   }
 
   // Split $text into words, keeping track of where the word boundaries are.
-  $words = preg_split('/' . $boundary . '+/u', $text, NULL, PREG_SPLIT_OFFSET_CAPTURE);
+  $words = preg_split('/' . $boundary . '+/u', $text, -1, PREG_SPLIT_OFFSET_CAPTURE);
   // Add an entry pointing to the end of the string, for the loop below.
   $words[] = ['', strlen($text)];