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String.prototype.supplant = function (o) {
  return this.replace(/{([^{}]*)}/g,
    function (a, b) {
      var r = o[b];
      return typeof r === 'string' || typeof r === 'number' ? r : a;
    }
  );
};

// Usage
// Pass in an object with the vars correspondent to those on the original string
"The date today is {todayDate}, thank you {name}".supplant({
  "todayDate" : new Date().toString(),
  "name" : "Clark Kent"
});