code: function replaceDelimiters(str, source, escape) {
    var regex = cache[source] || (cache[source] = new RegExp(source, 'g'));
    var match;
  
    while ((match = regex.exec(str))) {
      var prefix = str.slice(0, match.index);
      var inner = (escape ? '\\' : '') + '{{' + match[1] + '}}';
      var suffix = str.slice(match.index + match[0].length);
      str = prefix + inner + suffix;
    }
    return str;
  }
docs: Replace or delimiters in the given string.
  
  ```js
  var replaced = delimiters.replace(str, ['<%=', '%>']);
  ```
  @name .replace
  @param {String} `str` String with handlebars to replace or escape.
  @param {String} `source` The delimiters regex source string to conver to a regular expression.
  @param {Boolean} `escape` If true, replacements are escaped with a double-slash.
  @return {String}
  @api public