JSFiddle - React, Tailwind, and code Playground
JavaScript
var url = "http://stackoverflow.com/questions/16449482/check-to-see-a-url-contains-a-certain-character-how-many-times";
console.log(url.replace(/[^\/]/g, "").length);
var url = "http://stackoverflow.com/questions/16449482/check-to-see-a-url-contains-a-certain-character-how-many-times";
console.log(url.replace(/[^\/]/g, "").length);