Converts text in the Grammarly editor to markdown. To use it, paste the code into the console & copy the resulting string's contents.

grammarly2markdown.js

$('.ql-editor[contenteditable="true"]').innerHTML
	/** @note escape characters */
	.replace(/\#/g, '\\#')
	.replace(/\*/g, '\\*')
	/** @note convert headings */
	.replace(/<\/h[1-6]>/g, '\n')
	.replace(/<h1>/g, '# ')
	.replace(/<h2>/g, '## ')
	.replace(/<h3>/g, '### ')
	.replace(/<h4>/g, '#### ')
	.replace(/<h5>/g, '##### ')
	.replace(/<h6>/g, '###### ')
	/** @note replace move whitespace outside of styled text to prevent markdown problems */
	.replace(/( +)(<\/(em|strong|u)+>)/g, '$2$1')
	/** @note bold & italic text */
	.replace(/<\/*em>/g, '*')
	.replace(/<\/*strong>/g, '**')
	/** @note please don't use underline, as this might not work in all markdown flavors */
	.replace(/<\/*u>/g, '__')
	/** @note paragraphs */
	.replace(/<\/p>/g, '\n')
	.replace(/<p>/g, '')
	/** @note linebreaks */
	.replace(/<br[^>]*>/g, '\n\n')
	/** @note links */
	.replace(/<a .* href="([^"]+)" [^>]+>([^<]+)<\/a>/g, '[$2]($1)')
	/** @note strip remaining HTML tags */
	.replace(/<\/*\w[^>]+>/g,'')
	/** @note prevent paragraph indents from becoming code blocks */
	.replace(/\t/g, '\n')
	/** @note double dashes to em dashes */
	.replace(/--/g, '—')
	/** @note remove trailing whitespace */
	.replace(/ +(\n)/g, '$1')

Test string <p><strong><em><u>Bold-italic-underline</u></em></strong></p><p><em>italic</em></p><p><u>underline</u></p><h1>h1</h1><h2>h2</h2><p><a class="editor-rtfLink" href="http://startpage.com" target="_blank">link</a></p><ol data-type="ordered"><li>ordered</li><li class="ql-indent-1"><br></li><li>list</li></ol><ul data-type="bullet"><li>unordered</li><li class="ql-indent-1"><br></li><li>list</li></ul><p><br></p><p><br></p>