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Testing if a IP is valid

 
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ComputerTech
Master


Joined: 22 Feb 2020
Posts: 393
PostPosted: Mon Jun 28, 2021 6:31 pm    Post subject: Testing if a IP is valid Reply with quote
So i am trying to find a code that will check if a IP has the correct syntax of a IPv4 or IPv6 IP, i have no idea how that would look, but all help is much appreciated Smile
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CrazyCat
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Joined: 13 Jan 2002
Posts: 1032
Location: France
PostPosted: Tue Jun 29, 2021 2:36 am    Post subject: Reply with quote
Hum, did you look @ https://regex101.com/library?orderBy=RELEVANCE&page=1&search=IP ?
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caesar
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Joined: 14 Oct 2001
Posts: 3741
Location: Mint Factory
PostPosted: Tue Jun 29, 2021 3:01 am    Post subject: Reply with quote
Here's a better link with Regular Expression Examples.

If you don't want to fiddle with regexp and basically reinvent the wheel, then use the ip package that comes with TCLlib that offers some tools to validate ipv4 or ipv6, like:
Code:

% package require ip
1.4
::ip::version 192.168.0.1
1
% ::ip::version 192.168.0.256
-1
% ::ip::is ipv4 192.168.0.1
1
% ::ip::version 192.198.0.256
-1
% ::ip::version 2001:bc8:32d7:26c::
6

You can find the source code of a previous version here (or if you are on Debian you should find it in /usr/share/tcltk/tcllib1.20/dns/ip.tcl, if not do a locate ip.tcl) to see what other commands are available.
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ComputerTech
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Joined: 22 Feb 2020
Posts: 393
PostPosted: Tue Jun 29, 2021 9:06 am    Post subject: Reply with quote
Awesome! Thanks very much caesar Very Happy

And thanks CrazyCat for the link you provided as well Smile
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