code: function (str) {
          // here:xx:xxx??inline
          var matches = /^<!--\s*here\:(.*?)\s*-->$/.exec(str.trim())
          if (!matches || !matches[1]) return null
          var expr = matches[1]
          var parts = expr.split('??')
          var query = querystring.parse(parts[1] || '')
          var isInline = ('inline' in query) && query.inline != 'false'
          var isWrapping = query.wrap !== 'false'
          var namespace = ''
          var reg
  
          expr = parts[0]
          parts = expr.split(':')
          if (parts.length > 1) {
              namespace = parts.shift()
          }
          reg = new RegExp(parts.pop())
  
          return {
              regexp: reg,          // resource match validate regexp
              namespace: namespace, // resource namespace match
              inline: isInline,      // whether inline resource or not
              wrap: isWrapping
          }
      }
docs: Here' tag expression parse functon