Replace \@<= backreferences with \zs

Author: living180

syntax/gitcommit.vim

@@ -57,37 +57,37 @@ if s:scissors
 else
   exe 'syn match gitcommitComment "^' . s:comment . '.*"'
 endif
-exe 'syn match   gitcommitTrailers "\n\@<=\n\%([[:alnum:]-]\+\s*:.*\|(cherry picked from commit .*\)\%(\n\s.*\|\n[[:alnum:]-]\+\s*:.*\|\n(cherry picked from commit .*\)*\%(\n\n*\%(' . s:comment . '\)\|\n*\%$\)\@="'
+exe 'syn match   gitcommitTrailers "\n\zs\n\%([[:alnum:]-]\+\s*:.*\|(cherry picked from commit .*\)\%(\n\s.*\|\n[[:alnum:]-]\+\s*:.*\|\n(cherry picked from commit .*\)*\%(\n\n*\%(' . s:comment . '\)\|\n*\%$\)\@="'
 
 unlet s:l s:comment s:scissors
 
 syn match   gitcommitTrailerToken "^[[:alnum:]-]\+\s*:" contained containedin=gitcommitTrailers
 
 syn match   gitcommitHash	"\<\x\{40,}\>" contains=@NoSpell display
-syn match   gitcommitOnBranch	"\%(^. \)\@<=On branch" contained containedin=gitcommitComment nextgroup=gitcommitBranch skipwhite
-syn match   gitcommitOnBranch	"\%(^. \)\@<=Your branch .\{-\} '" contained containedin=gitcommitComment nextgroup=gitcommitBranch skipwhite
+syn match   gitcommitOnBranch	"^. \zsOn branch" contained containedin=gitcommitComment nextgroup=gitcommitBranch skipwhite
+syn match   gitcommitOnBranch	"^. \zsYour branch .\{-\} '" contained containedin=gitcommitComment nextgroup=gitcommitBranch skipwhite
 syn match   gitcommitBranch	"[^ ']\+" contained
-syn match   gitcommitNoBranch	"\%(^. \)\@<=Not currently on any branch." contained containedin=gitcommitComment
-syn match   gitcommitHeader	"\%(^. \)\@<=\S.*[:：]\%(\n^$\)\@!$" contained containedin=gitcommitComment
-syn region  gitcommitAuthor	matchgroup=gitCommitHeader start=/\%(^. \)\@<=\%(Author\|Committer\|Date\):/ end=/$/ keepend oneline contained containedin=gitcommitComment transparent
-syn match   gitcommitHeader	"\%(^. \)\@<=commit\%( \x\{40,\}$\)\@=" contained containedin=gitcommitComment nextgroup=gitcommitHash skipwhite
-syn match   gitcommitNoChanges	"\%(^. \)\@<=No changes$" contained containedin=gitcommitComment
+syn match   gitcommitNoBranch	"^. \zsNot currently on any branch." contained containedin=gitcommitComment
+syn match   gitcommitHeader	"^. \zs\S.*[:：]\%(\n^$\)\@!$" contained containedin=gitcommitComment
+syn region  gitcommitAuthor	matchgroup=gitCommitHeader start=/%(^. \zs\%(Author\|Committer\|Date\):/ end=/$/ keepend oneline contained containedin=gitcommitComment transparent
+syn match   gitcommitHeader	"%(^. \zscommit\%( \x\{40,\}$\)\@=" contained containedin=gitcommitComment nextgroup=gitcommitHash skipwhite
+syn match   gitcommitNoChanges	"^. \zsNo changes$" contained containedin=gitcommitComment
 
-syn match   gitcommitType		"\%(^.\t\)\@<=[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained containedin=gitcommitComment nextgroup=gitcommitFile skipwhite
+syn match   gitcommitType		"^.\t\zs[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained containedin=gitcommitComment nextgroup=gitcommitFile skipwhite
 syn match   gitcommitFile		".\{-\}\%($\| -> \)\@=" contained nextgroup=gitcommitArrow
 syn match   gitcommitArrow		" -> " contained nextgroup=gitcommitFile
-syn match   gitcommitUntrackedFile	"\%(^.\t\)\@<=[^:：/]*\%(/.*\)\=$" contained containedin=gitcommitComment
+syn match   gitcommitUntrackedFile	"^.\t\zs[^:：/]*\%(/.*\)\=$" contained containedin=gitcommitComment
 
 syn region  gitcommitUntracked	start=/^\z(.\) Untracked files:$/ end=/^\z1\=$\|^\z1\@!/ contains=gitcommitHeader containedin=gitcommitComment containedin=gitcommitComment contained transparent fold
 syn region  gitcommitDiscarded	start=/^\z(.\) Change\%(s not staged for commit\|d but not updated\):$/ end=/^\z1\=$\|^\z1\@!/ contains=gitcommitHeader,gitcommitDiscardedType containedin=gitcommitComment containedin=gitcommitComment contained transparent fold
 syn region  gitcommitSelected	start=/^\z(.\) Changes to be committed:$/ end=/^\z1$\|^\z1\@!/ contains=gitcommitHeader,gitcommitSelectedType containedin=gitcommitComment containedin=gitcommitComment contained transparent fold
 syn region  gitcommitUnmerged	start=/^\z(.\) Unmerged paths:$/ end=/^\z1\=$\|^\z1\@!/ contains=gitcommitHeader,gitcommitUnmergedType containedin=gitcommitComment containedin=gitcommitComment contained transparent fold
 
-syn match   gitcommitUntrackedFile	"\%(^.\t\)\@<=.*" contained containedin=gitcommitUntracked
+syn match   gitcommitUntrackedFile	"^.\t\zs.*" contained containedin=gitcommitUntracked
 
-syn match   gitcommitDiscardedType	"\%(^.\t\)\@<=[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitDiscardedFile skipwhite
-syn match   gitcommitSelectedType	"\%(^.\t\)\@<=[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitSelectedFile skipwhite
-syn match   gitcommitUnmergedType	"\%(^.\t\)\@<=[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitUnmergedFile skipwhite
+syn match   gitcommitDiscardedType	"^.\t\zs[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitDiscardedFile skipwhite
+syn match   gitcommitSelectedType	"^.\t\zs[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitSelectedFile skipwhite
+syn match   gitcommitUnmergedType	"^.\t\zs[^[:punct:][:space:]][^/:：]*[^[:punct:][:space:]][:：]\ze "he=e-1 contained nextgroup=gitcommitUnmergedFile skipwhite
 syn match   gitcommitDiscardedFile	"\S.\{-\}\%($\| -> \)\@=" contained nextgroup=gitcommitDiscardedArrow
 syn match   gitcommitSelectedFile	"\S.\{-\}\%($\| -> \)\@=" contained nextgroup=gitcommitSelectedArrow
 syn match   gitcommitUnmergedFile	"\S.\{-\}\%($\| -> \)\@=" contained nextgroup=gitcommitUnmergedArrow

syntax/gitconfig.vim

@@ -12,9 +12,9 @@ syn case ignore
 syn sync minlines=10
 
 syn match   gitconfigComment	"[#;].*" contains=@Spell
-syn match   gitconfigSection	"\%(^\s*\)\@<=\[[a-z0-9.-]\+\]"
-syn match   gitconfigSection	'\%(^\s*\)\@<=\[[a-z0-9.-]\+ \+\"\%([^\\"]\|\\.\)*"\]'
-syn match   gitconfigVariable	"\%(^\s*\)\@<=\a[a-z0-9-]*\%(\s*\%([=#;]\|$\)\)\@=" nextgroup=gitconfigAssignment skipwhite
+syn match   gitconfigSection	"^\s*\zs\[[a-z0-9.-]\+\]"
+syn match   gitconfigSection	'^\s*\zs\[[a-z0-9.-]\+ \+\"\%([^\\"]\|\\.\)*"\]'
+syn match   gitconfigVariable	"^\s*\zs\a[a-z0-9-]*\%(\s*\%([=#;]\|$\)\)\@=" nextgroup=gitconfigAssignment skipwhite
 syn region  gitconfigAssignment  matchgroup=gitconfigNone start=+=\s*+ skip=+\\+ end=+\s*$+ contained contains=gitconfigBoolean,gitconfigNumber,gitConfigString,gitConfigEscape,gitConfigError,gitconfigComment keepend
 syn keyword gitconfigBoolean true false yes no contained
 syn match   gitconfigNumber  "\<\d\+\>" contained