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PHP Warning: preg_match(): Unknown modifier 'c' at PF_FormPrinter.php:1355
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Description

There might be partially user-controlled regular expression:

PHP Warning: preg_match(): Unknown modifier 'c' at /srv/mediawiki/tags/2019-10-26_15:23:42/extensions/PageForms/includes/PF_FormPrinter.php:1355)

My guess is that this can be triggered by having a / in section name in a page editable with page forms.