From d738a9b17f4cbb8cee0889d90f1c6858e1ee7826 Mon Sep 17 00:00:00 2001
From: Hiroshi Shirosaki <h.shirosaki@gmail.com>
Date: Tue, 19 Jan 2016 11:19:34 +0900
Subject: [PATCH] Simplify the regexp of italic and bold

Simplify the regexp to improve syntax performance.
Use \ze instead of \@=.
---
 syntax/markdown.vim | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index f14c867..c21d639 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -35,12 +35,12 @@ syn case ignore
 syn sync linebreaks=1
 
 "additions to HTML groups
-syn region htmlItalic start="\\\@<!\*\S\@=" end="\S\zs\\\@<!\*" keepend oneline
+syn region htmlItalic start="\\\@<!\*\ze\S" end="\S\zs\\\@<!\*" keepend oneline
 syn region htmlItalic start="\(^\|\s\)\@<=_\|\\\@<!_\([^_]\+\s\)\@=" end="\S\@<=[^\\]_\|[^\\]_\S\@=" keepend oneline
-syn region htmlBold start="\S\zs\*\*\|\*\*\S\@=" end="\S\zs\*\*\|\*\*\S\@=" keepend oneline
-syn region htmlBold start="\S\zs__\|__\S\@=" end="\S\zs__\|__\S\@=" keepend oneline
-syn region htmlBoldItalic start="\S\zs\*\*\*\|\*\*\*\S\@=" end="\S\zs\*\*\*\|\*\*\*\S\@=" keepend oneline
-syn region htmlBoldItalic start="\S\zs___\|___\S\@=" end="\S\zs___\|___\S\@=" keepend oneline
+syn region htmlBold start="\*\*\ze\S" end="\S\zs\*\*" keepend oneline
+syn region htmlBold start="__\ze\S" end="\S\zs__" keepend oneline
+syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend oneline
+syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend oneline
 
 " [link](URL) | [link][id] | [link][] | ![image](URL)
 syn region mkdFootnotes matchgroup=mkdDelimiter start="\[^"    end="\]"
-- 
2.39.5