else
let s:oneline = ' oneline'
endif
-execute 'syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]\%(\%([^*]\|\\\*\|\n\)*[^\\\*\t ]\)\?\*\_W" end="[^\\\*\t ]\zs\*\ze\_W" keepend' . s:oneline
-execute 'syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs_\ze\_W" keepend' . s:oneline
-execute 'syn region htmlBold start="\%(^\|\s\)\*\*\ze\S" end="\S\zs\*\*" keepend' . s:oneline
-execute 'syn region htmlBold start="\%(^\|\s\)\zs__\ze\S" end="\S\zs__" keepend' . s:oneline
-execute 'syn region htmlBoldItalic start="\%(^\|\s\)\zs\*\*\*\ze\S" end="\S\zs\*\*\*" keepend' . s:oneline
-execute 'syn region htmlBoldItalic start="\%(^\|\s\)\zs___\ze\S" end="\S\zs___" keepend' . s:oneline
+syn region mkdItalic matchgroup=mkdItalic start="\%(\*\|_\)" end="\%(\*\|_\)"
+syn region mkdBold matchgroup=mkdBold start="\%(\*\*\|__\)" end="\%(\*\*\|__\)"
+syn region mkdBoldItalic matchgroup=mkdBoldItalic start="\%(\*\*\*\|___\)" end="\%(\*\*\*\|___\)"
+execute 'syn region htmlItalic matchgroup=mkdItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]\%(\%([^*]\|\\\*\|\n\)*[^\\\*\t ]\)\?\*\_W" end="[^\\\*\t ]\zs\*\ze\_W" keepend contains=@Spell' . s:oneline . s:concealends
+execute 'syn region htmlItalic matchgroup=mkdItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs_\ze\_W" keepend contains=@Spell' . s:oneline . s:concealends
+execute 'syn region htmlBold matchgroup=mkdBold start="\%(^\|\s\)\zs\*\*\ze\S" end="\S\zs\*\*" keepend contains=@Spell' . s:oneline . s:concealends
+execute 'syn region htmlBold matchgroup=mkdBold start="\%(^\|\s\)\zs__\ze\S" end="\S\zs__" keepend contains=@Spell' . s:oneline . s:concealends
+execute 'syn region htmlBoldItalic matchgroup=mkdBoldItalic start="\%(^\|\s\)\zs\*\*\*\ze\S" end="\S\zs\*\*\*" keepend contains=@Spell' . s:oneline . s:concealends
+execute 'syn region htmlBoldItalic matchgroup=mkdBoldItalic start="\%(^\|\s\)\zs___\ze\S" end="\S\zs___" keepend contains=@Spell' . s:oneline . s:concealends
" [link](URL) | [link][id] | [link][] | ![image](URL)
syn region mkdFootnotes matchgroup=mkdDelimiter start="\[^" end="\]"
execute 'syn region mkdID matchgroup=mkdDelimiter start="\[" end="\]" contained oneline' . s:conceal
execute 'syn region mkdURL matchgroup=mkdDelimiter start="(" end=")" contained oneline' . s:conceal
-execute 'syn region mkdLink matchgroup=mkdDelimiter start="\\\@<!!\?\[" end="\n\{-,1}[^]]\{-}\zs\]\ze[[(]" contains=@mkdNonListItem,@Spell nextgroup=mkdURL,mkdID skipwhite oneline' . s:concealends
+execute 'syn region mkdLink matchgroup=mkdDelimiter start="\\\@<!!\?\[\ze[^]\n]*\n\?[^]\n]*\][[(]" end="\]" contains=@mkdNonListItem,@Spell nextgroup=mkdURL,mkdID skipwhite' . s:concealends
" Autolink without angle brackets.
" mkd inline links: protocol optional user:pass@ sub/domain .com, .co.uk, etc optional port path/querystring/hash fragment
syn region mkdLinkTitle matchgroup=mkdDelimiter start=+(+ end=+)+ contained
"HTML headings
-syn region htmlH1 start="^\s*#" end="$" contains=@Spell
-syn region htmlH2 start="^\s*##" end="$" contains=@Spell
-syn region htmlH3 start="^\s*###" end="$" contains=@Spell
-syn region htmlH4 start="^\s*####" end="$" contains=@Spell
-syn region htmlH5 start="^\s*#####" end="$" contains=@Spell
-syn region htmlH6 start="^\s*######" end="$" contains=@Spell
-syn match htmlH1 /^.\+\n=\+$/ contains=@Spell
-syn match htmlH2 /^.\+\n-\+$/ contains=@Spell
+syn region htmlH1 start="^\s*#" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn region htmlH2 start="^\s*##" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn region htmlH3 start="^\s*###" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn region htmlH4 start="^\s*####" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn region htmlH5 start="^\s*#####" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn region htmlH6 start="^\s*######" end="$" contains=mkdLink,mkdInlineURL,@Spell
+syn match htmlH1 /^.\+\n=\+$/ contains=mkdLink,mkdInlineURL,@Spell
+syn match htmlH2 /^.\+\n-\+$/ contains=mkdLink,mkdInlineURL,@Spell
"define Markdown groups
syn match mkdLineBreak / \+$/
-syn region mkdBlockquote start=/^\s*>/ end=/$/ contains=mkdLineBreak,@Spell
+syn region mkdBlockquote start=/^\s*>/ end=/$/ contains=mkdLink,mkdInlineURL,mkdLineBreak,@Spell
syn region mkdCode start=/\(\([^\\]\|^\)\\\)\@<!`/ end=/\(\([^\\]\|^\)\\\)\@<!`/
syn region mkdCode start=/\s*``[^`]*/ end=/[^`]*``\s*/
syn region mkdCode start=/^\s*\z(`\{3,}\)[^`]*$/ end=/^\s*\z1`*\s*$/
syn match mkdCode /^\s*\n\(\(\s\{8,}[^ ]\|\t\t\+[^\t]\).*\n\)\+/
syn match mkdCode /\%^\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+/
syn match mkdCode /^\s*\n\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+/ contained
-syn match mkdListItem /^\s*\%([-*+]\|\d\+\.\)\s\+/ contained
+syn match mkdListItem /^\s*\%([-*+]\|\d\+\.\)\ze\s\+/ contained
syn region mkdListItemLine start="^\s*\%([-*+]\|\d\+\.\)\s\+" end="$" oneline contains=@mkdNonListItem,mkdListItem,@Spell
syn region mkdNonListItemBlock start="\(\%^\(\s*\([-*+]\|\d\+\.\)\s\+\)\@!\|\n\(\_^\_$\|\s\{4,}[^ ]\|\t+[^\t]\)\@!\)" end="^\(\s*\([-*+]\|\d\+\.\)\s\+\)\@=" contains=@mkdNonListItem,@Spell
syn match mkdRule /^\s*\*\s\{0,1}\*\s\{0,1}\*$/