Coverage. Youtube
.
@[youtube](x)
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube]( x)
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube]( x )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube](
x )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube](
x
 )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.

Coverage. Youtube
.
@[youtube](x)
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube]( x)
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube]( x )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube](
x )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[youtube](
x
 )
.
<p><iframe id="ytplayer" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/x" frameborder="0"/></p>
.
.
@[]youtube()
.
<p>@[]youtube()</p>
.
.
@[youtube]()
.
<p></p>
.
.
@[yourtube](x)
.
<p>@<a href="x">yourtube</a></p>
.
.
@[(youtube]
.
<p>@[(youtube]</p>
.

Add tests to handle some of the negative cases
Add tests to handle some of the negative cases
