Render JS string templates

example.js

var data = {
  business: {
    id: 123,
    service: "Cleaners",
    name: "Weeoo",
    user: {
      id: 987,
      name: "Jeff Smith"
    }
  }
};

var template = "{business['user']['name']}'s business: {business['name']}, {business['service']}.";

var output = render(template, data); // John Smith's business: Weeoo, Cleaners.

render.js

function render(string, data) {
  var regex = /{[\w\[\]']+?}/mig, //'
      sub_regex = /\[[\w']+?\]/i;
  return string.replace(regex, function(pattern, index) {
    var name = pattern.replace(/({|})/g, '');
    try {
      if (sub_regex.test(name)) { // Build object from string
        var match_key = /\['([\w]+?)'\]/ig,
            keys = [],
            builder = data[name.match(/\w+/)[0]], // Get base object
            match;
        while (match = match_key.exec(name)) keys.push(match[1]); // Get object keys
        for (var i=0; i<keys.length; i++) builder = builder[keys[i]]; // Build object from keys
        
        return builder;
      }
      else return data[name].toString(); // Simply just a key, no need to build object
    }
    catch (e) {
      throw(new Error('Cannot find template variable: {'+name+'}.'));
    }
  });
};