in-text URL (links in content) (tag)

links_add_target()	Adds the `target` attribute with the specified value to all links (A tags) in the given text.
make_clickable()	Converts non-clickable links in the text - `http://ссылка` into clickable ones (an HTML link). Also converts text starting with: www, ftp, email into links.
wp_rel_nofollow()	Adds `rel="nofollow"` to all `<a>` elements in the passed text. Internal links are skipped.