Re: I THOUGHT I'd finally understood genex

$local_ip_match starts by the character m, so it will try to match something that contains an m. That's probably not what you want.

The m in m/REGEX/ is an operator, so it should not be inside the string. You can try:
$s =~ m/^192\.168\.|^10\.|^127\.0\.|^172\.16\./
or if you want to store the regex in a variable: $local_ip_match = qr/^192\.168\.|^10\.|^127\.0\.|^172\.16\./; see qr

Who's genex?

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Re^2: I THOUGHT I'd finally understood genex by JEDtoo (Novice) on Jan 09, 2018 at 15:10 UTC
1) genex are either "Young folks" or a lisdexic spelling of regex - you choose 2) using qr fixed my problem, which WASN'T the expression so changing it was NEVER going to work.THANK YOU!! BTW: The list of Internet IPs is a list of real addresses trying to log into my server as root or admin or pi right now. My REAL program blocks all further traffic from those addresses, unless they are local.	[reply]
Re^3: I THOUGHT I'd finally understood genex by Your Mother (Archbishop) on Jan 09, 2018 at 16:08 UTC
The youngest genexers® are in their late 30s now with the bulk being in their 40s and some in their 50s; only be "young folks" in Okinawa. :P	[reply]
Re^4: I THOUGHT I'd finally understood genex by JEDtoo (Novice) on Jan 09, 2018 at 16:14 UTC
I was born in 1952. GenX ARE young folks. Most of them probably can't even write Fortran!	[reply]
Re^5: I THOUGHT I'd finally understood genex by Laurent_R (Canon) on Jan 09, 2018 at 18:34 UTC
Re^5: I THOUGHT I'd finally understood genex by karlgoethebier (Abbot) on Jan 14, 2018 at 19:35 UTC
Re^2: I THOUGHT I'd finally understood genex by Laurent_R (Canon) on Jan 09, 2018 at 14:53 UTC
Who's genex? JEDtoo probably means regex. Update: ... and, BTW, has now fixed the title of the original post.	[reply]
Re^3: I THOUGHT I'd finally understood genex by Eily (Monsignor) on Jan 09, 2018 at 14:55 UTC
And I was joking ;-). The original title was edited anyway :)	[reply]