Optimize regular matching rules (#2188)

data/category-ntp

@@ -2,16 +2,16 @@
 regexp:^time(.euro)?.apple.com$
 
 # Facebook
-regexp:^time([1-5])?.facebook.com$
+regexp:^time([1-5])?\.facebook\.com$
 
 # Google
 regexp:^time([1-4])?.google.com$
 
 # NIST: https://tf.nist.gov/tf-cgi/servers.cgi
-regexp:^((((ut1-wwv)|(ntp\-(b|d|wwv))|(time(\-(([a-e]\-(g|b))|([a-e]\-wwv)))?)).nist.gov)|((ntp-c|ut1-time)|(utcnist(2|3)?)).colorado.edu)$
+^((((ut1-wwv)|(ntp\-(b|d|wwv))|(time(\-(([a-e]\-(g|b))|([a-e]\-wwv)))?))\.nist\.gov)|((ntp-c|ut1-time)|(utcnist(2|3)?))\.colorado\.edu)$
 
 # NTP-servers: https://ntp-servers.net/servers.html
-regexp:^ntp[0-7].ntp-servers.net$
+regexp:^ntp[0-7]\.ntp-servers\.net$
 
 clock.isc.org
 ntp.fiord.ru