Help with view on multiple pages I experimented for a few hours with drupal (tried contextual filters) and searched across the internet, but couldn't find a solution for my problem. (I'm not a "drupal engineer", so maybe it's very easy to solve this problem, but I couldn't). 

I have view that I want to use on multiple pages on our drupal site. 
If the user browses to http://www.mywebsite.com/######, is it possible to display that view, but showing only nodes that contain "######" in a specific field in the content type displayed by that view?

edit: when ####### isn't found in that field (if 'ts available in the content type), of course it should not show the view. When ######### isn't provided (http://www.mywebsite.com/), it should display the view without te filter....
You did not specify if this is a block view or a page view.

If it's a page view, you have to use /something/% as your path.

1) Add your field in question as a contextual filter. (I used title as an example)

2) Use Provide a default value 


Raw Value from URL
Path is 1 assuming its yourwebsite.com/####. Path is 2 if yourwebsite.com/something/####