rt
 * last updated on 2022/07/31, v0.90, refine frontmatter (simple yaml)  
 *
 * Copyright (c) 2022, Casualwriter (MIT Licensed)
 * https://github.com/casualwriter/casual-markdown
*****************************************************************************/
// define md object, and extent function (which is a dummy function)
var md = { yaml:{}, before: function (str) {return str}, after: function (str) {return str} }

// function for REGEXP to convert html tag. ie. <TAG> => &lt;TAG*gt;  
md.formatTag = fu