Grep

get rid of comments, even lines that start with space and then have comments:

more /etc/apache2/vhosts.d/default_vhost.include | egrep -v '^\s?#'

remove comments , and blanks lines:

cat /srv/gitblit-1.4.1/data/gitblit.properties | egrep -v '^\s?#' | grep -v "^[[:space:]]*$"

drop in replacement for grep: sift, lone binary https://sift-tool.org/download

grep comment

egrep -v '^\s?#'

or possibly:

egrep -v '^\s+#'