code: function getSubheadingsTopLevel( text ) {
  	const subheadings = [];
  	const regex = /<h([2-3])(?:[^>]+)?>(.*?)<\/h\1>/ig;
  	let match;
  
  	while ( ( match = regex.exec( text ) ) !== null ) {
  		subheadings.push( match );
  	}
  
  	return subheadings;
  }
docs: Gets all the level 2 and 3 subheadings from the text and returns these in an array.
  
  @param {string} text The text to return the headings from.
  
  @returns {Array<string[]>} Matches of subheadings in the text, first key is everything including tags,
  second is the heading level, third is the content of the subheading.