Re: Adding an Entire Class B IP Range to an Array

my $octet = join ",", 1..254;
my @result = glob "192.168.{$octet}.{$octet}";
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-- Randal L. Schwartz, Perl hacker
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Comment on Re: Adding an Entire Class B IP Range to an Array Download Code

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Re^2: Adding an Entire Class B IP Range to an Array by Dru (Hermit) on Mar 31, 2005 at 17:24 UTC
Beautiful. I might have to use this instead.	[reply]
Re^2: Adding an Entire Class B IP Range to an Array by johnnywang (Priest) on Mar 31, 2005 at 17:58 UTC
Can someone explain this, please? it works, but I don't understand it.	[reply]
Re^3: Adding an Entire Class B IP Range to an Array by Tanktalus (Canon) on Mar 31, 2005 at 18:03 UTC
By reading the docs on glob, we note that this is now implemented in terms of File::Glob. Check that documentation out for File::Glob, and look for GLOB_BRACE. Here it happens that knowing how csh works is advantageous when coding perl.	[reply]
Re^3: Adding an Entire Class B IP Range to an Array by ikegami (Patriarch) on Mar 31, 2005 at 18:04 UTC
It's what `glob` does. `glob('{a,b}{1,2}')` returns `('a1', 'a2', 'b1', 'b2')`. I have other examples in my scratchpad.	[reply] [d/l] [select]
Re^2: Adding an Entire Class B IP Range to an Array by kelan (Deacon) on Mar 31, 2005 at 21:08 UTC
I thought this might progress the braced expressions together (giving '192.168.1.1', '192.168.2.2', '192.168.3.3', etc.) so I wanted to test it. But when I did, it didn't even do that. Instead it gives: 192.168.1. 192.168.2. 192.168.3. 192.168.4. 192.168.5. 192.168.6. 192.168.7. 192.168.8. 192.168.9. 192.168.10. 192.168.11. 192.168.12. 192.168.13. 192.168.14. 192.168.15. 192.168.16. 192.168.17. 192.168.18. 192.168.19. 192.168.20. ... Is there a limit to glob expansion? It works as expected if I change `1..254` to `1..6`, for example.	[reply]