Pastable version of Markdown-like editor

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 <pre class="sunburst">function toHTML(code) {
	code = removeTags(code)
	code = convertTables(code)
	code = convertLists(code)
	code = removeBlankLines(code)
	code = convertHeaders(code)
	code = convertParagraphs(code)
	code = convertNewLines(code)
	code = convertLinks(code)
	code = convertBolds(code)
	code = convertItalics(code)
	return code
}

/**
 * Removes any html code blocks by encoding '&lt;' and '&gt;'
 */
function removeTags(code) {
	code = code.replace(/&gt;/g,&quot;&amp;gt;&quot;)
	return code.replace(/&lt;/g,&quot;&amp;lt;&quot;)
}

/**
 * Removes blank lines such that there is at most one blank line between texts
 */
function removeBlankLines(code) {
	return code.replace(/\n\n+\n/gm,&quot;\n\n&quot;)
}

/**
 * Takes links in the format of &quot;link text&quot;:[link (with spaces)] and converts
 * it to a valid href link
 */
function convertLinks(code) {
	return code.replace(/&quot;([^&quot;]*)&quot;:\[([^\]]*)\]/gm,function(match,text,url) {
		return &quot;&lt;a href=\&quot;&quot;+url+&quot;\&quot;&gt;&quot;+text+&quot;&lt;/a&gt;&quot;
	})
}

/**
 * Takes headers in the form of &quot;h#. Header Text&quot; and surrounds them with
 * &lt;h#&gt; tags
 */
function convertHeaders(code) {
	return code.replace(/^[hH](\d). *(.*) */gm,function(match,number,text) {
		return &quot;&lt;h&quot;+number+&quot;&gt;&quot;+text+&quot;&lt;/h&quot;+number+&quot;&gt;&quot;
	})
}

/**
 * Replaces any new lines that do not signify a new paragraph with &lt;br&gt; tags
 */
function convertNewLines(code) {
	/*return code.replace(/(?!\n)/gm,function(match,text) {
		return text+&quot;&lt;br&gt;&quot;
	})*/
	return code.replace(/(.| )$\n(?!(\n|&lt;))/gm,function(match,text) {
		return text+&quot;&lt;br&gt;\n&quot;
	})
}

/**
 * Takes any block of text not already converted into HTML and surrounds it with
 * &lt;p&gt; tags. A block of text is one which has a blank line either preceding or
 * proceding it.
 */
function convertParagraphs(code) {
	return code.replace(/^\n?(([^&lt;\n]|\n(?!\n)| )*)/gm,function(match,text) {
		if(text)
			return &quot;\n&lt;p&gt;&quot;+text+&quot;&lt;/p&gt;&quot;
		return &quot;&quot;
	})
}

/**
 * Converts text surrounded by two consecutive '*' into bolded text with
 * &lt;strong&gt; tags
 */
function convertBolds(code) {
	return code.replace(/\*\*(.+)\*\*/gm,function(match,text) {
		return &quot;&lt;strong&gt;&quot;+text+&quot;&lt;/strong&gt;&quot;
	})
}

/**
 * Converts text surrounded by a single '*' into italics text with &lt;em&gt; tags
 */
function convertItalics(code) {
	return code.replace(/\*(.+)\*/gm,function(match,text) {
		return &quot;&lt;em&gt;&quot;+text+&quot;&lt;/em&gt;&quot;
	})
}

/**
 * Takes blocks of text which look like the below and form them into a valid
 * HTML table. Pipes ('|') signify the start of a new cell
 * Forward-slashes ('/') signify the end of a row
 *
 * | cell 1 | cell 2 /
 * | cell 3 | cell 4 /
 *
 * &lt;table&gt;
 * 		&lt;tr&gt;
 * 			&lt;td&gt;cell 1&lt;/td&gt;&lt;td&gt;cell 2&lt;/td&gt;
 * 		&lt;/tr&gt;
 * 		&lt;tr&gt;
 * 			&lt;td&gt;cell 3&lt;/td&gt;&lt;td&gt;cell 4&lt;/td&gt;
 * 		&lt;/tr&gt;
 * &lt;/table&gt;
 */
function convertTables(code) {
	return code.replace(/\|(.|\n(?!\n))*\//g,function(match) {
		match = match.replace(/^\| *(?=.)/gm,&quot;&lt;tr&gt;&lt;td&gt;&quot;)
		match = match.replace(/ *\| *(?=.)/gm,&quot;&lt;/td&gt;&lt;td&gt;&quot;)
		match = match.replace(/ *\/$/gm,&quot;&lt;/td&gt;&lt;/tr&gt;&quot;)
		return &quot;&lt;table&gt;&quot;+match+&quot;&lt;/table&gt;&quot;
	})
}

/**
 * Let a list Item be defined by &quot; *[-*+]|([a-zA-Z0-9](.|\))) *&quot;
 * Let the number of spaces before a list Item be the Item Rank
 * Let the subness of a list be its Order
 *
 * Let there be a relational list between previous Ranks and their Order called R/O-Prev
 *
 * If R/O-Prev is empty then Order = 1
 * If the Rank is in R/O-Prev then Order = R/O-Prev[Rank]
 * If the Rank is greater than previous then the Order is increased by 1
 * If the Rank is lesser than previous then Order = Order associated with the closest but less Rank
 * Association is set in R/O-Prev and all greater Rank associations are nullified
 */
function convertLists(code) {
	code = code.replace(/^ *[-*+](.|\n(?!\n))*/gm,function(match) {
		var html = &quot;&quot;
		var ranks = []	//order = index, rank = ranks[index]
		var lists = [] //order = index, type = lists[index] = &quot;&lt;/ul&gt;&quot; or &quot;&lt;/ol&gt;&quot;
		var getRank = function(arrRanks, curRank) {
			for(var i=0;i&lt;arrRanks.length;i++)
				if(arrRanks[i]==curRank)
					return i
				else if(arrRanks[i]&gt;curRank)
					return i-1&gt;=0?i-1:0
			return arrRanks.length
		}
		//var bullet = /^( *)[-*+]((.|\n *[\w\d])*)/gm
		/**
		 * ^( *)					#number of spaces
		 * ([-*+]|[a-zA-Z0-9][).])	#orderd vs unordered
		 * ((.|\n *[\w\d]{2,})*)	#to end of line or next line if not
		 * 							#beginning of new item
		 */
		var bullet = /^( *)([-*+]|[a-zA-Z0-9][).])((.|\n *[\w\d]{2,})*)/gm
		var prevOrder = -1, prevRank = -1, order, rank
		while((item = bullet.exec(match))!=null) {
			rank = item[1].length
			//figure out the order
			if(ranks.length==0)
				order = 0
			else {
				if(rank&gt;prevRank) {
					order = ranks.length
					ranks[ranks.length] = rank
				} else {
					order = getRank(ranks,rank)
				}
			}
			ranks[order] = rank		//ensure rank is in there
			//reinit spArr
			if(order&lt;prevOrder) {
				var nRanks = []
				for(var i=0;i&lt;=order;i++)
					nRanks[i] = ranks[i]
				ranks = nRanks
			}
			/**
			 * Apply HTML. Each item should be given an open 
			 */
			if(order&gt;prevOrder) {
				if(item[2].substr(0,1)=='-') {
					html += &quot;\n&lt;ul&gt;&quot;
					lists[order] = &quot;\n&lt;/ul&gt;&quot;
				}
				else {
					html += &quot;&lt;ol&gt;&quot;
					lists[order] = &quot;&lt;/ol&gt;&quot;
				}
				html += &quot;&lt;li&gt;&quot;+item[3]
			} else if(order&lt;prevOrder) {
				for(var i=prevOrder;i&gt;order;i--)
					html+=&quot;&lt;/li&gt;&quot;+lists[i]
				html += &quot;&lt;/li&gt;&lt;li&gt;&quot;+item[3]
				
			} else
				html += &quot;&lt;/li&gt;&lt;li&gt;&quot;+item[3]
			//order and rank are now old
			prevRank = rank
			prevOrder = order
		}
		html += &quot;&lt;/li&gt;&lt;/ul&gt;&quot;
		return html
	})
	return code
}
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Pastable version of Markdown-like editor