Remove and replace words with php

[V]

I'm not sure how to do this.. I'm using a Jquery script that expands YouTube videos when you click on a link or thumbnail but it works only with this type of YouTube url - for a full screen video.

 

 

but generally a youtube link is like this.

 

 

I need to remove "watch", "?", and replace "=" with "/"

 

I submit these links via a form input. Instead of manually changing the URL it would be neat if I can just paste it and let php do the rest.

 

 

[Psycho]

You are making it harder than it needs to be by trying to replace characters before and after the "v". Just do a simple replace of '/watch?v=' with '/v/' using str_replace().

 

$link = str_replace('/watch?v=', '/v/', $link);

[plutomed]

$link = preg_replace("/watch\?v=/", "v/", $var);

 

Edit: Or what mjdamato said.

[V]

Thank you for the code! It's work perfectly