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Re: Don't Use Regular Expressions To Parse IP Addresses!

by dws (Chancellor)
on Dec 21, 2002 at 02:24 UTC ( #221555=note: print w/replies, xml ) Need Help??

in reply to Don't Use Regular Expressions To Parse IP Addresses!

Regular expressions should not be used to parse IP addresses because IP addresses can be expressed in several forms...

"Yes, but..."

There are plenty of situations, such as parsing server logfiles, where four-part IP addresses are a given. In these cases, using a regex is just fine.

The only case I've actually run across in practice where using a regex isn't safe is when parsing URLs where some spammer has obscured an IP address by using a non-standard forms.

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Node Type: note [id://221555]
[hippo]: Anyone able to get to https://deps. Not even getting a connection from here.
[choroba]: Down for everyone of just me
[shmem]: "Problem loading page" here
[marto]: seems down
[planetscape]: Able to ping but not connect with either Opera or Firefox
[thanos1983]: same here...
[choroba]: marto ;-)
[Discipulus]: after an error now is back
[shmem]: looks like a 302 loop - "The document has moved here"
[Discipulus]: ..but only http not https

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