Error "preg_match_all" with Wordpress SEO by Yoast plugin

pasta_paul

I hope someone could realy help me... I get this error message : "error Warning: preg_match_all() [function.preg-match-all]: Unknown modifier 'I' in /home/sulistyo/public_html/wp-content/plugins/wordpress-seo/admin/linkdex/linkdex.php on line 476" when I enter/write a focus keyword on wordpress seo meta box. I don't know what to do to solve the error. I hope someone or the developer of the plugin (Joost de Valk) could help me with this error -...

Originally asked by sulistyo on Stack Exchange (wordpress) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

I browsed through all the versions available here http://plugins.trac.wordpress.org/browser/wordpress-seo/tags/ and nowhere is there any "I" modifier. The "I" modifier is obviously invalid, thus the error. Updating the plugin will most certainly solve the issue. Or at least, if updates are not possible, edit line 476 of /wp-content/plugins/wordpress-seo/admin/linkdex/linkdex.php and turn $keywordCount = preg_match_all("/".$job["keyword"]."/msIU", $body, $res); or whatever it may have to: $keywordCount = preg_match_all("/".$job["keyword"]."/msiU", $body, $res); An update : After you mentioned 'P' being an invalid modifier, it suddenly struck me that the keyword is not escaped and that you...

Full answer by soulseekah: https://wordpress.stackexchange.com/a/47604 (CC BY-SA 4.0).

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