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<?php $body = 'jasfjkdnjksdfnvv href="http://films.imhonet.ru/element/1341324/" ffr 3432 32 efwfrewqf ff3223423 href="http://imhonet.ru.vk.com/?w=wall-14483947_3270" vfsdvfvfsdv '; var_dump(preg_replace( '/(?<=href=["\'])([^"\'/]*?(?://)?[^"\'/]*?imhonet\.ru/?[^"\']*)/im',#'/(?<=href=["\'])([^"\']+i '$1?partner_id='.'142342314'.'&auth_hash='.'dsf34rt43ff34rt43r', $body));