code: function matchChild(parent, rule) {
    var childRegExp = new RegExp("(, )?(" + parent.selector + " [^,s]*),?.*"); // eslint-disable-line no-useless-escape
    return rule.selector !== parent.selector && rule.selector.match(childRegExp) !== null;
  }
docs: Get rules for selectors nested within parent node
  
  @param {obj} PostCSS CSS object
  @return {object} Parent rule for which children should be included