Look up value in multidimensional array

[funnyguppy]

I'm new to Javascript, and am having a bit of trouble figuring out some things... so hopefully this will be an easy one.

I want a lookup table that matches url fragments to the name I want to show. For instance, if a url contains "yahoo.com", I want to print "Yahoo." For now, I created a multidimensional array that maps url fragments to a name. such as,

var urlMapping = [
{ urlpath: "yahoo.com", mapto: "Yahoo"}, 
{ urlpath: "google.com", mapto: "Google"}
];

So, say I have a variable urlVar, where the value is some URL (for example, "http://us.mg201.mail.yahoo.com").

Is there any way - other than looping through the array for every variable - to check if urlVar contains any of the substrings in urlMapping.urlPath, and if so, output urlMapping.mapto? (In this case, I want urlVar to find that it contains the substring "yahoo.com" and output "Yahoo".) In my code, I anticipate that I have 100 variables checked against 50 mappings, and performance is important to me.

Thanks in advance!

[Old Pedant]

Ummm...what's wrong with simply:

var mapping = {
    "yahoo.com" : "Yahoo",
    "msn.com" : "MicroSlopNews",
    "google.com" : "gOOgle",
    ...
    };

var value = mapping[ key.toLowerCase() ];
...

??

[funnyguppy]

Probably nothing, but like I said - I'm totally new to JavaScript. What would that do?

[funnyguppy]

Oh, I think I understand... in the above code, you'd assume that "key" = "yahoo.com", which would return the value of "Yahoo." Which is almost what I need - except that my key would actually be something like "www.yahoo.com/abc/xyz/index.html" - where it's not going to be an exact match to what's in the mapping, but I need to know if the URL contains something in the map.

Any advice for that?

[Old Pedant]

oh, ugh...

No, I don't see a way to do that other than a loop.

Can't even think of a sneaky way to do it with regexp's, though there might be...hmmm...likely not to be that much faster, though.

[funnyguppy]

worth a shot... thanks!