Retrieves galleries from the passed post’s content.

Retrieve the image srcs from galleries from a post’s content, if present

Check a specified post’s content for gallery and, if present, return the first

Checks a post’s content for galleries and return the image srcs for the first found gallery

Return RegEx body to liberally match an opening HTML tag.

Extracts and returns the first URL from passed content.

Get a numeric user ID from either an email address or a login.

Whether the passed content contains the specified shortcode

Adds any domain in a multisite installation for safe HTTP requests to the allowed list.

Whether a registered shortcode exists named $tag