The problem is that what is or is not an IP address
really depends on the file semantics,
not just on what an IP address "looks like."
A simple regex match for dotted-quad "IP addresses"
in arbitrary text will give you false positives.
In the HTML source for one site I maintain, for example,
such a regex would
match the following:
1.41.1.1
Is it an IP address?
Nope, it's an RCS version number,
and blindly
assuming it's an IP address
would be wrong at best
and dangerous at worst.
That said,
@ip_addrs = m/{regex to match IP}/g;
will select only the "IP address" texts from $_
for whatever regex you choose,
without the danger of relying on $1.
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