runtime(pandoc): update YAML metadata block parsing in compiler runtime

Commit: 
https://github.com/vim/vim/commit/1aa68dffbf2a80d143ee0e659289dbbc430606af
Author: Alexander Abrosimov <alexander.n.abrosi...@gmail.com>
Date:   Thu May 15 20:06:29 2025 +0200

    runtime(pandoc): update YAML metadata block parsing in compiler runtime
    
    Previously the incorrect regexp forced title to be a single letter
    because of using '+' instead of the '\+' regexp modifier.
    
    closes: #17321
    
    Signed-off-by: Alexander Abrosimov <alexander.n.abrosi...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/compiler/pandoc.vim b/runtime/compiler/pandoc.vim
index 5d90a518c..40d2d0263 100644
--- a/runtime/compiler/pandoc.vim
+++ b/runtime/compiler/pandoc.vim
@@ -2,6 +2,7 @@
 " Compiler:     Pandoc
 " Maintainer:   Konfekt
 " Last Change: 2024 Nov 19
+" 2025 May 15 Update the title regex for CompilerSet #17321
 "
 " Expects output file extension, say `:make html` or `:make pdf`.
 " Passes additional arguments to pandoc, say `:make html --self-contained`.
@@ -51,7 +52,7 @@ endfunction
 
 execute 'CompilerSet makeprg=pandoc'..escape(
     \ ' --standalone'..
-    \ (s:PandocFiletype(&filetype) ==# 'markdown' && (getline(1) =~# 
'^%\s\+\S\+' || (search('^title:\s+\S+', 'cnw') > 0)) ?
+    \ (s:PandocFiletype(&filetype) ==# 'markdown' && (getline(1) =~# 
'^%\s\+\S\+' || (search('^title:\s\+\S\+', 'cnw') > 0)) ?
     \ '' : ' --metadata title=%:t:r:S')..
     \ ' '..s:PandocLang()..
     \ ' --from='..s:PandocFiletype(&filetype)..

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