PHP message: PHP Warning: preg_match_all():

Hello,

We apologize for the issue you are facing with the PHP warning related to preg_match_all(). This error typically indicates that there may be a problem with the regular expressions being used or that the PHP version on your server might not be compatible with Rank Math.

To resolve this issue, we recommend checking the following:

1. PHP Version: Ensure that your server is running a supported version of PHP. Rank Math requires a stable and secure version of PHP to function correctly. You can find more information on upgrading your PHP version here.
2. Regular Expressions: If you are using any custom regex patterns in your settings, double-check them for correctness. Incorrect patterns can lead to warnings or errors.

If the issue persists after checking these points, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further. Thank you for raising this concern!

Hello,

Thank you for contacting us. We apologize for any inconvenience this issue may have caused.

That error refers to a mismatch in the parentheses of some of your focus keywords.

Sometimes, you might use parentheses to group words together or to indicate a variation – however, if you forget to close a parenthesis, or if you have an extra one, this can cause the error message to appear.

To fix this problem, you need to check the focus keyword of the posts/pages and make sure that every parenthesis is matched with a closing one.

If the issue persists, we can check the issue on your website for you. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.

Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:

https://wordpress.org/plugins/temporary-login-without-password/

You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):

https://wordpress.org/plugins/wp-security-audit-log/

We really look forward to helping you.

Hello,

We can’t seem to replicate the issue on your website. We visited some of your posts but we couldn’t see the same error message.

The error is most likely caused by a mismatch in the parentheses of some of your focus keywords.

Sometimes, you might use parentheses to group words together or to indicate a variation – however, if you forget to close a parenthesis, or if you have an extra one, this can cause the error message to appear.

To fix this problem, you need to check the focus keyword or the SEO meta fields of the page and make sure that every parenthesis is matched with a closing one.

If you know the affected page. Please share the URL here and we’ll fix the issue ourselves.

Looking forward to helping you.