错误信息
Deprecated function: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in _extract_rg_title() (line 90 of modules/custom/unsw_publication/unsw_publication.helpers.inc).
Deprecated function: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in _extract_url() (line 133 of modules/custom/unsw_publication/unsw_publication.helpers.inc).