I have this so far:

chrome.tabs.getSelected(null, function(tab) 

{

    var title = tab.title;

    var btn = '<a href="' + tab.url + '" onclick="save('' + title + '');"> ' + title + '</a>';

        

    if(tab.url.match('/http://www.example.com/version.php/i')) 

    {

        document.getElementById('link').innerHTML = '<p>' + btn + '</p>';

    }

});

Basically it should match the domain within this:

http://www.example.com/version.php?*

Anything that matches that even when it includes something like version.php?ver=1, etc

When I used the code above of mine, it doesn't display anything, but when I remove the if statement, it's fine but it shows on other pages which it shouldn't only on the matched URL.

EDIT:

if(tab.url.match(/http://www.example.com/version.php/i)) 

{

    document.getElementById('link').innerHTML = '<p>' + btn + '</p>';

}

Doesn't even work somehow...