weseek__growi/resource/js/util/PreProcessor/MarkdownFixer.js

export default class MarkdownFixer {
  process(markdown) {
    var x = markdown
      .replace(/^(#{1,})((?![\s\#]+).+)$/gm, '$1 $2') // spacer for section
      .replace(/>[\s]*\n>[\s]*\n/g, '> <br>\n> \n');

    return x;
  }
}