/usr/share/vim/addons/syntax/notmuch-search.vim is in notmuch-vim 0.21-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | syntax region nmSearch start=/^/ end=/$/ oneline contains=nmSearchDate
syntax match nmSearchDate /^.\{-13}/ contained nextgroup=nmSearchNum
syntax match nmSearchNum /.\{-4}/ contained nextgroup=nmSearchFrom
syntax match nmSearchFrom /.\{-21}/ contained nextgroup=nmSearchSubject
syntax match nmSearchSubject /.\{0,}\(([^()]\+)$\)\@=/ contained nextgroup=nmSearchTags
syntax match nmSearchTags /.\+$/ contained
highlight link nmSearchDate Statement
highlight link nmSearchNum Type
highlight link nmSearchFrom Include
highlight link nmSearchSubject Normal
highlight link nmSearchTags String
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