How can I use JavaScript to match a string inside

问题:

I have used the excellent gskinner.com/RegExr/ tool to test my string matching regex but I cannot figure out how to implement this into my JavaScript file to return true or false.

The code I have is as follows:

^(http:)\/\/(.+\.)?(stackoverflow)\.

on a url such as http://stackoverflow.com/questions/ask this would match (according to RegExr) http://stackoverflow.

So this is great because I want to try matching the current window.location to that string, but the issue I am having is that this JavaScript script does not work:

var url = window.location;
if ( url.match( /^(http:)\/\/(.+\.)?(stackoverflow)\./ ) ) 
{
    alert('this works');
};

Any ideas on what I am doing wrong here?

Thanks for reading.

Jannis

回答1:

If you want to test domain name (host) window.location.host gives you what you need (with subdomain)

if( /^(.*\.)?stackoverflow\./.test(window.location.host) ){
    alert('this works');
}

回答2:

window.location is not a string; it's an object. Use window.location.href