/usr/share/source-highlight/conf.lang is in libsource-highlight-common 3.1.7-1.
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 | # highlighting for generic configuration files
include "properties.lang"
include "desktop.lang"
include "xorg.lang"
variable = '([[:alpha:]]|_)[[:word:]]*(?==)'
variable = '\$\{([^[:blank:]]+)\}'
variable = '\$\(([^[:blank:]]+)\)'
variable = '\$([[:alpha:]]|_)[[:word:]]*'
variable = '\$([^[:blank:]]{1})'
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