Email Validation regex for RFC-2822

\b can be replicated as (?<=\w)(?=\W)|(?<=\W)(?=\w) Understanding how to create these class transitions can be beneficial for several reasons. In this instance, counting the results of this regex can be used to measure randomness within strings containing multiple character classes.

Allows you to retrieve information from the linux command route -n directly from your PHP code (or any other language). Example: 0.0.0.0 192.168.100.254 0.0.0.0 UG 100 0 0 enp2s0 10.8.0.1 10.8.0.109 255.255.255.255 UGH 0 0 0 tun0...