如何匹配以****加下劃線的線條

Question

爲了突出顯示，如何匹配用星號突出顯示的線條？

1. Really big title 
******************* 

Answer 1

在降價高亮（https://github.com/plasticboy/vim-markdown/blob/master/syntax/mkd.vim）plasticboy做這樣的：

"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=\+$/ contains=@Spell "<-- Here is the one I think you want 
syn match htmlH2  /^.\+\n-\+$/ contains=@Spell 

爲了完整降價標題如下：

H1 header 
========= 

H2 header 
---------