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HTML

              
                <a href="#" id="raw-switch" class="raw-switch">Raw: <span></span></a>
<aside id="markdown" contenteditable>
Is this an alternative h1?
=================
  
It sure is, and this is an alternative h2 syntax
---------------------------------------
  
# hi1
## hi2
### hi3
#### hi4
  
hi how are ya? just adding a bit of [multiline text](https://google.com?q=multiline%20text "Google homepage") with a title for the link. And a [link](https://google.com) without to see how it works out in the parser ya know.
  
##### hi5
  
> een quite for your pleasure just one question, is it multiline? Yes it sure is sir
  
###### hi6
  
Okay so that seems to all work fine, how about some other stuff like *italic* text and using an alternative _italic_ text syntax to make it look more classic and give it a bit of an italian look.
  
And some **bold** text to make it stronger and stuff.
  
![Placehold.it 200x200 image](http://placehold.it/200x200)
  
Or **_bold and italic_** just like that
  
And what about bold with a __alternative syntax__.
  
Oh and hey when we're at it why not add some ~~striked through~~ text as well right?
  
## Just other stuff

But what about some lists?
  
* Bananas
* Apples
* Grapefruits
* Oranges
  
And with some numberssss
  
1. Star Trek
2. Good Fellas
3. Star Wars
4. Legally Blond
  
How about *some* **yeah** or **oh YEAH!**
  
#### Finding new YEAH's!
  
```language-js
ws.getMonkeys(race, type, callback);
```
  
And what about some more **bold** and *italic* text then, maybe also some ~~striked through text~~?
  
### What about some code?
  
Gotta love some inline `{}` objects and other code like `window.getMonkeys`.

#### Single lined
  
1. hi dude
2. how are ya?

* u good?
* yeah right?
  
But I mean how awesome are **cats** though with their *furry* fur and everything?
Pretty awesome right?
</aside>
<section id="output-html"></section>
              
            
!

CSS

              
                $base-color: #444;
$grey: #f1f1f1;

$padding-m: 40px 80px;


* {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

html,body {
  height: 100%;
  margin: 0;
}

body {
  font: 300 16px 'Cousine';
  color: $base-color;
  line-height: 1.5em;
}

.raw-switch {
  font-size: .9em;
  color: $base-color;
  position: fixed;
  top: 20px;
  left: 40px;
  z-index: 1;
}

aside,section {
  width: 50%;
  padding: $padding-m;
}

aside {
  background: $grey;
  
  white-space: pre-wrap;
  
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  
  overflow-y: scroll;
  
  float: left;
  
  &:focus {
    outline: none;
  }
}

section {
  height: 100%;
  margin-left: 50%;
  
  overflow-y: scroll;
  overflow-x: hidden;
  
  h1 {
    font-size: 1.8em;
  }
  
  b {
    font-weight: 700;
  }
  
  pre {
    overflow-y: scroll;
  }
}
              
            
!

JS

              
                function parseMd(md){
  
  //ul
  md = md.replace(/^\s*\n\*/gm, '<ul>\n*');
  md = md.replace(/^(\*.+)\s*\n([^\*])/gm, '$1\n</ul>\n\n$2');
  md = md.replace(/^\*(.+)/gm, '<li>$1</li>');
  
  //ol
  md = md.replace(/^\s*\n\d\./gm, '<ol>\n1.');
  md = md.replace(/^(\d\..+)\s*\n([^\d\.])/gm, '$1\n</ol>\n\n$2');
  md = md.replace(/^\d\.(.+)/gm, '<li>$1</li>');
  
  //blockquote
  md = md.replace(/^\>(.+)/gm, '<blockquote>$1</blockquote>');
  
  //h
  md = md.replace(/[\#]{6}(.+)/g, '<h6>$1</h6>');
  md = md.replace(/[\#]{5}(.+)/g, '<h5>$1</h5>');
  md = md.replace(/[\#]{4}(.+)/g, '<h4>$1</h4>');
  md = md.replace(/[\#]{3}(.+)/g, '<h3>$1</h3>');
  md = md.replace(/[\#]{2}(.+)/g, '<h2>$1</h2>');
  md = md.replace(/[\#]{1}(.+)/g, '<h1>$1</h1>');
  
  //alt h
  md = md.replace(/^(.+)\n\=+/gm, '<h1>$1</h1>');
  md = md.replace(/^(.+)\n\-+/gm, '<h2>$1</h2>');
  
  //images
  md = md.replace(/\!\[([^\]]+)\]\(([^\)]+)\)/g, '<img src="$2" alt="$1" />');
  
  //links
  md = md.replace(/[\[]{1}([^\]]+)[\]]{1}[\(]{1}([^\)\"]+)(\"(.+)\")?[\)]{1}/g, '<a href="$2" title="$4">$1</a>');
  
  //font styles
  md = md.replace(/[\*\_]{2}([^\*\_]+)[\*\_]{2}/g, '<b>$1</b>');
  md = md.replace(/[\*\_]{1}([^\*\_]+)[\*\_]{1}/g, '<i>$1</i>');
  md = md.replace(/[\~]{2}([^\~]+)[\~]{2}/g, '<del>$1</del>');
  
  //pre
  md = md.replace(/^\s*\n\`\`\`(([^\s]+))?/gm, '<pre class="$2">');
  md = md.replace(/^\`\`\`\s*\n/gm, '</pre>\n\n');
  
  //code
  md = md.replace(/[\`]{1}([^\`]+)[\`]{1}/g, '<code>$1</code>');
  
  //p
  md = md.replace(/^\s*(\n)?(.+)/gm, function(m){
    return  /\<(\/)?(h\d|ul|ol|li|blockquote|pre|img)/.test(m) ? m : '<p>'+m+'</p>';
  });
  
  //strip p from pre
  md = md.replace(/(\<pre.+\>)\s*\n\<p\>(.+)\<\/p\>/gm, '$1$2');
  
  return md;
  
}

var rawMode = true;
    mdEl = document.getElementById('markdown'),
    outputEl = document.getElementById('output-html'),
    parse = function(){
      outputEl[rawMode ? "innerText" : "innerHTML"] = parseMd(mdEl.innerText);
    };

parse();
mdEl.addEventListener('keyup', parse, false);

//Raw mode trigger btn
(function(){

  var trigger = document.getElementById('raw-switch'),
      status = trigger.getElementsByTagName('span')[0],
      updateStatus = function(){
        status.innerText = rawMode ? 'On' : 'Off';
      };

  updateStatus();
  trigger.addEventListener('click', function(e){
    e.preventDefault();
    rawMode = rawMode ? false : true;
    updateStatus();
    parse();
  }, false);
  
}());
              
            
!
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