/usr/share/javascript/edit-area/reg_syntax/ is in libjs-edit-area 0.8.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/javascript/edit-area/reg_syntax/basic.js
/usr/share/javascript/edit-area/reg_syntax/brainfuck.js
/usr/share/javascript/edit-area/reg_syntax/c.js
/usr/share/javascript/edit-area/reg_syntax/coldfusion.js
/usr/share/javascript/edit-area/reg_syntax/cpp.js
/usr/share/javascript/edit-area/reg_syntax/css.js
/usr/share/javascript/edit-area/reg_syntax/html.js
/usr/share/javascript/edit-area/reg_syntax/java.js
/usr/share/javascript/edit-area/reg_syntax/js.js
/usr/share/javascript/edit-area/reg_syntax/pas.js
/usr/share/javascript/edit-area/reg_syntax/perl.js
/usr/share/javascript/edit-area/reg_syntax/php.js
/usr/share/javascript/edit-area/reg_syntax/python.js
/usr/share/javascript/edit-area/reg_syntax/robotstxt.js
/usr/share/javascript/edit-area/reg_syntax/ruby.js
/usr/share/javascript/edit-area/reg_syntax/sql.js
/usr/share/javascript/edit-area/reg_syntax/tsql.js
/usr/share/javascript/edit-area/reg_syntax/vb.js
/usr/share/javascript/edit-area/reg_syntax/xml.js