How to block domains in linux?

Question

Regular Expressions

How (in the easiest way) to block access to sites with obscene content?
PS I know about iptables, but maybe there is an option without manually knocking out url-s?

Answer 1

Specifically for this line, you can do this:

$str = '~astbbhf_sg_fasgs~3.6.0=SOME_OTHER_STRING.~phase2~3.6.0=OLD';
preg_match('/someflag.*=(.+?)\./i', $str, $m);
$result = $m[1];

accordingly, if there are no matches, then it $resultwill be equal tonull

Answer 2

^(~[A-Za-z]+_(someflag.*?=(.+?)\.~.*|.*)|.*)
for example, the command for bash using perl is:

echo '~astring_someflag_xds~2.37.0=NEEDED_STRING_TO_EXTRACT.~cha_khe_mil~2.22.0=TADA' \
| perl -pe 's/^(~[a-z]+_(someflag.*?=(.+?)\.~.*|.*)|.*)/\3/i'

well, or as a script on the same perl:

$_='~astring_someflag_xds~2.37.0=NEEDED_STRING_TO_EXTRACT.~cha_khe_mil~2.22.0=TADA';
s/^(~[a-z]+_(someflag.*?=(.+?)\.~.*|.*)|.*)/\3/i;
print;

for php it would probably be something like:

$str = '~astring_someflag_xds~2.37.0=NEEDED_STRING_TO_EXTRACT.~cha_khe_mil~2.22.0=TADA';
preg_match('s/^(~[a-z]+_(someflag.*?=(.+?)\.~.*|.*)|.*)/i', $str, $m);
print($m[3]);

Answer 3

Yandex Family (register DNS)
77.88.8.7
77.88.8.3
Without adult sites