String.prototype.template.js

String.prototype.template = function (object) {
  // Andrea Giammarchi - WTFPL License
  var
    stringify = JSON.stringify,
    re = /\$\{(.*?)\}/g,
    evaluate = [],
    i = 0,
    m
  ;
  while (m = re.exec(this)) {
    evaluate.push(
      stringify(this.slice(i, re.lastIndex - m[0].length)),
      '(' + m[1] + ')'
    );
    i = re.lastIndex;
  }
  evaluate.push(stringify(this.slice(i)));
  // Function is needed to opt out from possible "use strict" directive
  return Function('with(this)return' + evaluate.join('+')).call(object);
};