Javascript Regex Hostname

I have this urls : https://ift.tt/2sRdT86 / https://ift.tt/2kUtWyp / https://ift.tt/2xZMg2m and a lot more of them.

I would like to have a javascript function for if( regexforDomaine . "mywebsite" . regexforextend == true ){}

I have been trying if(location.hostname.match('/(.)mywebsite(.)')){} But it do not seem to be working.

Any idea there ? Thank you !