Well, I think you already guessed from the title what this is about.

I wrote this and it actually works:

\define video(url, w:"400px", h:"300px")
<iframe width="$w$" height="$h$" src="""$url$""" frameborder="0" 
allowfullscreen></iframe>
\end


but I don't want to manually change https://www.youtube.com/watch?v=VIDEOID 
to https://www.youtube.com/embed/VIDEOID

I think I already know what should be done: "removeprefix" of 
"https://www.youtube.com/watch?v="; and "addprefix" of 
"https://www.youtube.com/embed/"; if the whole url is inserted or just 
addprefix if that's only VIDEOID, 

"but"... I don't know what the proper syntax should be ¯\_(ツ)_/¯ .  (as 
well as I don't quite understand that "triple quotes" thingy).

I've searched the forum and see that someone made even a plugin for that: 
[Plugin] 
Embed YouTube Videos 
<https://groups.google.com/forum/#!searchin/TiddlyWiki/youtube|sort:relevance/tiddlywiki/yqRbxVsYdok/nOOQi73BAwAJ>.
 
Though I don't understand why you need a whole plugin for that if it's just 
a very simple macro. But I may check RichLinks 
<http://richlinks.tiddlyspot.com/> later (currently it's just excessive to 
my needs).


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