code: function Delimiters (delims, options) {
    this.options = options || {};
    this.delims = delims || [];
  
    this.defaults = merge({}, {
      beginning: '^',           // '^' Matches beginning of input.
      matter: '([\\s\\S]+?)',   // The "content" between the delims
      body: '([\\s\\S]+|\\s?)', // The "content" after the delims
      end: '$',                 // '$' Matches end of input.
      flags: ''                 // RegExp flags: g, m, i
    }, options);
  }
docs: Generate regular expressions for template delimiters.
  
  @param  {Array} `delims`
  @param  {Object} `options`