$ grep --version
grep (GNU grep) 2.25
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and others, see <http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>.
$ cat file.txt
http://example1.com/any-url/
https://example2.com/any-url/
http-example3.com/any-url/
http://example4.com/any-url/
https://example5.com/any-url/
$ grep -v '.*:.*' file.txt
http-example3.com/any-url/
$ grep -v : file.txt
http-example3.com/any-url/
$