/usr/share/man/man1/regtest.1.gz is in gcpegg 5.1-13.
This file is owned by root:root, with mode 0o644.
It is a symlink to /usr/share/man/man1/./usr/share/man/man1/eggsh.1.gz
/usr/share/man/man1/./usr/share/man/man1/eggsh.1.gz