preg_match() [function.preg-match]: Compilation failed …query.php

Same thing happened on my my site.

Can anyone help us?

Have you gone through the troubleshooting thread here?

https://www.ads-software.com/support/topic/wordpress-37-master-list?replies=5

Yes, tried all the suggestions on that page but still the issue occurs.

We’re tracking it here: https://core.trac.www.ads-software.com/ticket/25709

You can ignore the warning, your site is OK, and we’ll fix it in version 3.7.1.

There are a few ways to hide that warning for now — ideally, you set PHP’s display_errors setting to Off, though I recognize many may not know how to do that. If absolutely necessary, go into wp-includes/query.php and add an @ before the preg_match() on line 1990. It would become:

if ( ! $term || @preg_match( '/^\p{L}$/u', $term ) )

Again, your site is OK, even with this warning.

The quick fix “@ before the preg_match()” hide the warning.

Thanks, Andrew!

Resolved @preg_match at line 1990 works. Thanks