Automattic/jetpack — pull request #46 by jeherve (2014-01-03 17:59:40+00:00)
Title: Media Extractor: avoid notices when preg_match fails

`preg_match` sometimes fails to return all the necessary information that help us rebuild the URL. In such cases, it throws a warning. This commit fixes it.

More details here:
http://wordpress.org/support/topic/non-robust-code-in-jetpack_media_meta_extractorget_images_from_html