core:GenerateGroups: Fix use of "/e" preg_replace modifier.
core:GenerateGroups: Fix use of "/e" preg_replace modifier.

See: https://wiki.php.net/rfc/remove_preg_replace_eval_modifier

Thanks to Thijs Kinkhorst for providing this patch!

sitya/saml2,madmatt/saml2,sgomez/saml2,ArtemTeleshev/php-saml2,cb8/saml2,newmen/saml2,simplesamlphp/saml2