From: Hiroshi Shirosaki <h.shirosaki@gmail.com>
Date: Tue, 19 Jan 2016 01:36:56 +0000 (+0900)
Subject: Improve syntax regexp performance
X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/dc9e985df1102c9204690a15596eaef07d9cfbb3

Improve syntax regexp performance

Use \zs instead of \@<= if possible.
---

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 63429b3..f14c867 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\@<=\\\@<!\*" keepend oneline
+syn region htmlItalic start="\\\@<!\*\S\@=" end="\S\zs\\\@<!\*" keepend oneline
 syn region htmlItalic start="\(^\|\s\)\@<=_\|\\\@<!_\([^_]\+\s\)\@=" end="\S\@<=[^\\]_\|[^\\]_\S\@=" keepend oneline
-syn region htmlBold start="\S\@<=\*\*\|\*\*\S\@=" end="\S\@<=\*\*\|\*\*\S\@=" keepend oneline
-syn region htmlBold start="\S\@<=__\|__\S\@=" end="\S\@<=__\|__\S\@=" keepend oneline
-syn region htmlBoldItalic start="\S\@<=\*\*\*\|\*\*\*\S\@=" end="\S\@<=\*\*\*\|\*\*\*\S\@=" keepend oneline
-syn region htmlBoldItalic 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
 
 " [link](URL) | [link][id] | [link][] | ![image](URL)
 syn region mkdFootnotes matchgroup=mkdDelimiter start="\[^"    end="\]"