"syn region Comment matchgroup=mkdDelimiter start="\%^---$" end="^\(---\|\.\.\.\)$"  contains=tkTag keepend

syntax region tkLink matchgroup=tkBrackets start=/\[\[/ end=/\]\]/ display oneline
syntax region tkHighlight matchgroup=tkBrackets start=/==/ end=/==/ display oneline

syntax match tkTag "\v#[a-zA-Z]+[a-zA-Z0-9/\-_]*"
syntax match tkTag "\v:[a-zA-Z]+[a-zA-Z0-9/\-_]*:"

syntax match tkTagSep "\v\s*,\s*" contained
syntax region tkTag matchgroup=tkBrackets start=/^tags\s*:\s*\[\s*/ end=/\s*\]\s*$/ contains=tkTagSep display oneline

" " just blue
"     hi tklink ctermfg=Blue cterm=bold,underline
"     hi tkBrackets ctermfg=gray

" " for gruvbox
"     hi tklink ctermfg=72 cterm=bold,underline
"     hi tkBrackets ctermfg=gray

" " Highlight ==highlighted== text 
"     hi tkHighlight ctermbg=yellow ctermfg=darkred cterm=bold
"
" " Tags
" hi tkTagSep ctermfg=gray
" hi tkTag ctermfg=magenta