Change mkdRule match syntax to be more liberal

Consider any line beginning with 3 or more of '*', '-', or '_' with
possible spaces before and between, possibly followed by zero or more of
the previously matched symbols or spaces to be a horizontal rule.

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 43cb8988e2265a1060856958ecc7b6db90cf62f0..008a6d83d5e27dbcd69e88bad65b57a495e37d43 100644 (file)
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -108,11 +108,9 @@ syn match  mkdCode         /^\s*\n\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+/ containe
 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}\*$/
-syn match  mkdRule         /^\s*-\s\{0,1}-\s\{0,1}-$/
-syn match  mkdRule         /^\s*_\s\{0,1}_\s\{0,1}_$/
-syn match  mkdRule         /^\s*-\{3,}$/
-syn match  mkdRule         /^\s*\*\{3,5}$/
+syn match  mkdRule         /^\s*\*\s\{0,1}\*\s\{0,1}\*\(\*\|\s\)*$/
+syn match  mkdRule         /^\s*-\s\{0,1}-\s\{0,1}-\(-\|\s\)*$/
+syn match  mkdRule         /^\s*_\s\{0,1}_\s\{0,1}_\(_\|\s\)*$/
 
 " YAML frontmatter
 if get(g:, 'vim_markdown_frontmatter', 0)