JSFiddle - React, Tailwind, and code Playground

JavaScript

var Router = {
	'routes': [
		{
			'uri' : 'about'
		},
		{
			'uri' : /rank\/([0-9]{1,})$/
		},
	]
};
doesUriExistInRouter = function(uri) {
	var routeFound = null;
	_(Router.routes).each(function(route){
		var routeUri = route.uri;
		var regexPattern = null;
		if( routeUri.toString()[routeUri.toString().length - 2] == '$' ) {// is defined as regex
			regexPattern = new RegExp( '^' + routeUri.toString().substr(0, routeUri.toString().length - 2)  + '$' );
		} else {
			regexPattern = new RegExp( '^' + routeUri + '$' );
		}
		if (!_.isNull(uri.match(regexPattern))) {
			routeFound = routeUri;
			return;
		}
	});
	return routeFound != null ? routeFound : false;
}
_(['about', '/rank/2', 'nope']).each(function(uri){
	if(doesUriExistInRouter(uri) !== false) {
		console.log('Router for '+uri+' found');
	} else {
		console.log('Router for '+uri+' NOT found');
	}
});