Search using a regex inside a deeply nested JS Object

searchObject.js

var searchObject = function(o, expr, callback, path, visited) {
  try{
    visited = visited || new Set();
    path = path || '';
    if (visited.has(o)) { return; }
    if (!o) { return; }
    visited.add(o);
    if (typeof o === 'string') {
      if (o.match(expr)) {
        callback(path);
      }
    } else if (typeof o === 'object') {
      Object.keys(o).forEach(function(k){
        if (o.hasOwnProperty(k)){     	
          searchObject(o[k], expr, callback, path + '/' + k, visited);
        }
      });
    }
  } catch (e) {
  	console.error(['Could not access ' + path, e]);
  }
};