Ticket #28506: control_char_filter.diff

wp-includes/formatting.php

@@ -154 +154 @@
                 $dynamic[ '/(?<!xn)--/' ] = $en_dash;
                 $dynamic[ '/(?<=' . $spaces . ')-(?=' . $spaces . ')/' ] = $en_dash;
 
+                // Remove control (non-printing) characters, but preserve line feeds and carriage returns (\r and \n).
+                $dynamic[ '/[\x00-\x09\x0B\x0C\x0E-\x1F\x7F]/' ] = '';
+
                 $dynamic_characters = array_keys( $dynamic );
                 $dynamic_replacements = array_values( $dynamic );
         }