title: Good BNF grammar tutorial / introduction for a beginner?
body: <p>What's your tip for an introduction to BNF grammar (and how to use them in practice)? </p>
  
  <p>Something concise with many examples would be great. Have been googling but only found enormously long artcles with unclear examples so far :/</p>
  
  <p>(In my particular case, I'm trying to parse the <a href="https://bitbucket.org/galaxy/galaxy-central/wiki/ToolConfigSyntax" rel="nofollow">Galaxy Toolconfig syntax</a>, which includes if/else statements etc.)</p>