Famous Perl One-Liners Explained, Part VII: Handy Regular Expressions

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November 14, 2011, 21:09

(Same commenter as previous comment.)

#109 is bad too because other notations for IPs are valid.

Here is one example:

# Find out the IP of example.com
$ dig +short example.com A
192.0.43.10

# Convert it into another notation
$ python2 -c "print 192*256**3 + 0*256**2 + 43*256**1 + 10*256**0"
3221236490

# Demo, just to prove that this really works
$ ping 3221236490
PING 3221236490 (192.0.43.10) 56(84) bytes of data.
64 bytes from 192.0.43.10: icmp_req=1 ttl=241 time=101 ms
64 bytes from 192.0.43.10: icmp_req=2 ttl=241 time=101 ms
^C
--- 3221236490 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 101.011/101.265/101.519/0.254 ms

Oh and *then* there is IPv6.

Dear Peter Krumin, I know its boring but please take a look at the specs from time to time, especially if you want to publish something like this. This I-don't-care-if-I-violate-the-standard attitude that we see so often these days (especially but not exclusively in corporate environments) really bugs me because in the end we all suffer from it. Right?

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