Getting a preg_replace unknown modifier '/' notice for Infinite SEO

Warning: preg_replace() [function.preg-replace]: Unknown modifier '/' in /home/shelter/public_html/renewatl.com/wp-content/plugins/wpmu-dev-seo/wds-files/wds-autolinks/wds-autolinks.php on line 191

Warning: preg_split() [function.preg-split]: Unknown modifier '/' in /home/shelter/public_html/renewatl.com/wp-content/plugins/wpmu-dev-seo/wds-files/wds-autolinks/wds-autolinks.php on line 195