/usr/share/nano/default.nanorc is in nano 2.9.3-2.
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 13 14 15 16 17 | ## An example of a default syntax. The default syntax is used for
## files that do not match any other syntax.
syntax "default"
comment "#"
# Comments.
color cyan "^[[:space:]]*#.*"
# Spaces in front of tabs.
color ,red " + +"
# Nano's name, including version.
color brightred "(GNU )?nano [1-9]\.[0-9]\.[^[:space:][:punct:]]+"
# Email addresses.
color magenta "<[[:alnum:].%_+-]+@[[:alnum:].-]+\.[[:alpha:]]{2,}>"
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