This file is indexed.

/usr/share/source-highlight/esc256.style 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.

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classname orange ;
comment gray ;
function blue;
keyword purple ;
preproc darkblue ;
regexp orange ;
string red ;
todo yellow ;
type green ;
usertype orange ;
variable green ;

// diff files
oldfile red ;
newfile green ;
difflines darkblue ;

// ChangeLog and log files
date blue ;
file red ;
ip orange ;
name green ;
time darkblue ;

// line numbers
linenum yellow ;

// Internet related
url blue ;

// for css
selector purple ;
property blue ;
value green ;

// ===== Useless =====
// cbracket
// normal
// number
// specialchar
// symbol
// ====