{"id":19030934,"date":"2026-09-28T07:21:03","date_gmt":"2026-09-28T07:21:03","guid":{"rendered":"https:\/\/wordpress.org\/support\/topic\/preg_match_all-compilation-failed-during-scan\/"},"modified":"2026-09-28T07:21:03","modified_gmt":"2026-09-28T07:21:03","slug":"preg_match_all-compilation-failed-during-scan","status":"publish","type":"topic","link":"https:\/\/wordpress.org\/support\/topic\/preg_match_all-compilation-failed-during-scan\/","title":{"rendered":"preg_match_all(): Compilation failed during Scan"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">PHP 8.4 with Defender 6.3.0 (but at least 6.2 as well).<br \/>If I run a scan I get thousands of these in the log:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PHP Warning: preg_match_all(): Compilation failed: digits missing after \\x or in \\x{} or \\o{} or \\N{U+} at offset 99 in \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/behavior\/scan\/class-malware-quick-scan.php on line 63<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Scan finishes with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PHP Fatal error: Maximum execution time of 0 seconds exceeded in \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/behavior\/scan\/class-malware-quick-scan.php on line 63<br \/><br \/>Stack trace:<br \/>0 \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/behavior\/scan\/class-malware-quick-scan.php(63): preg_match_all()<br \/>1 \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/behavior\/scan\/class-malware-scan.php(213): WP_Defender\\Behavior\\Scan\\Malware_Quick_Scan-&gt;do_quick_scan()<br \/>2 \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/component\/class-scan.php(347): WP_Defender\\Behavior\\Scan\\Malware_Scan-&gt;suspicious_check()<br \/>3 \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/component\/class-scan.php(291): WP_Defender\\Component\\Scan-&gt;suspicious_check()<br \/>4 \/&lt;path-to-site&gt;\/wp-content\/plugins\/wp-defender\/src\/component\/class-scan.php(174): WP_Defender\\Component\\Scan-&gt;task_handler()<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">And the web ui pretends to be done without an issue.<\/p>\n","protected":false},"template":"","class_list":["post-19030934","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19030934","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/19030934\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=19030934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}