title: Easiest way to replace placeholders (variables) in markdown text?
body: <p>I have need for an open format to write stories in a generic way (with placeholder/variables). To make the stories case specific I would like to set a list of key/value pairs and apply them when publishing. I also want to separate styling from content so I can easily publish to web, pdf etc. </p>
  
  <p>Example: <code>@varname@ is a great place.</code></p>
  
  <p>I chose Markdown to solve the content/styling separation but I do not know an easy way to parameterize certain parts of the text and have them filled in when I generate the html/pdf outputs with a tool like pandoc. </p>
  
  <p>Any suggestions? Can this be done with markdown or is there a suitable markdown extension?</p>