PHP Warning: preg_match_all()

Hello @senjoralfonso,
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Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
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The error message?preg_match_all?that you see on the header section of the page is most likely caused by a mismatch in the parentheses of some of your focus keywords.
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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.
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To fix this problem, you need to check the focus keyword of the page and make sure that every parenthesis is matched with a closing one.
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Let us know how this goes.

I am very sorry to inform you, that I do not use any parentheses… In general I have only one focus word per page. But I will try to have a look in the Database Table to see if there is any parentheses.

Hello @senjoralfonso,
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Sure, do let us know how that goes. If the issue persists, please share a recent error log to see if the date is much older. If you don’t see any parentheses in the focus keywords in the database, it is possible that the error log you see are old ones and the PHP warnings are already no longer generating.
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Hope that helps.