parser.js

'use strict';

function parse(obj, str) {
  var regex = /\{\{\s(\w{8})\.(\w+)\s\}\}/g,
      matches,
      results = [];
  
  while (matches = regex.exec(str)) {
    results.push({ key: matches[1], prop: matches[2] });
  }

  results.forEach(function(n) {
    var val = obj[n.key][n.prop] || '<nothing>';
    str = str.replace('{{ ' + n.key + '.' + n.prop + ' }}', val);
  });

  return str;
}

module.exports = parse;