Return true if any variation of strings matches in URL

I have these possible folder names in a url:

firstname+lastname
firstname-lastname
firstname lastname
Firstname+Lastname

I need a way to catch these, the common element would be firstname and lastname (so I don't care about the + - or space), but I do need to convert them toLowerCase();

Can this be done with a regex? (I am not particularly sophisticated in my use of regex, I can use basic match() functions.

My other thought was to store these variants in an array and return true if any of the items match one of the array items.

I was looking at this solution: http://ift.tt/1EuzboC

In this case though I think my array and statement would look something like this:

var strArray = ['firstname','lastname'];
strArray.toLowerCase();
var href = document.location.href;
var secondaryDir = href.split("/")[4];

if (secondaryDir in strArray){
  console.log('Its true!');
  // do magic here 
}

Not sure if there is a better way to test this?

(I've tagged this question with jquery as that is what I am using, although I think all the code here is vanilla js).

EDIT

Actually I don't need to worry about converting the array to lower case as I can do this against the secondaryDir variable (I think).