Basic preg_replace help

[FRSH]

I'm working with the youtube API and the function

 $relatedVideo->watchURL 

returns a video url

 

However when I use

preg_replace("youtube","test",$relatedVideo->watchURL);

it gives me the following error

preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Delimiter must not be alphanumeric or backslash in <b>C:\wamp\www\site\test.php</b> on line <b>317

 

Help please?

 

[bh]

Hi,

 

you need a delimiter such as /

 

preg_replace("/youtube/","test",$relatedVideo->watchURL);