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+URI.SafeIframeRegexp
+TYPE: string/null
+VERSION: 4.4.0
+DEFAULT: NULL
+--DESCRIPTION--
+<p>
+ A PCRE regular expression that will be matched against an iframe URI. This is
+ a relatively inflexible scheme, but works well enough for the most common
+ use-case of iframes: embedded video. This directive only has an effect if
+ %HTML.SafeIframe is enabled. Here are some example values:
+</p>
+<ul>
+ <li><code>%^http://www.youtube.com/embed/%</code> - Allow YouTube videos</li>
+ <li><code>%^http://player.vimeo.com/video/%</code> - Allow Vimeo videos</li>
+ <li><code>%^http://(www.youtube.com/embed/|player.vimeo.com/video/)%</code> - Allow both</li>
+</ul>
+<p>
+ Note that this directive does not give you enough granularity to, say, disable
+ all <code>autoplay</code> videos. Pipe up on the HTML Purifier forums if this
+ is a capability you want.
+</p>
+--# vim: et sw=4 sts=4