Regexp::Common::net -- provide regexes for IPv4 addresses.

    use Regexp::Common qw /net/;

    while (<>) {
        /$RE{net}{IPv4}/       and print "Dotted decimal IP address";
        /$RE{net}{IPv4}{hex}/  and print "Dotted hexadecimal IP address";
        /$RE{net}{IPv4}{oct}{-sep => ':'}/ and
                               print "Colon separated octal IP address";
        /$RE{net}{IPv4}{bin}/  and print "Dotted binary IP address";
        /$RE{net}{MAC}/        and print "MAC address";
        /$RE{net}{MAC}{oct}{-sep => " "}/ and
                               print "Space separated octal MAC address";
    }

Please consult the manual of Regexp::Common for a general description of the works of this interface.

Do not use this module directly, but load it via Regexp::Common.

This modules gives you regular expressions for various style IPv4 and MAC (or ethernet) addresses.

Returns a pattern that matches a valid IP address in "dotted decimal". Note that while 318.99.183.11 is not a valid IP address, it does match /$RE{net}{IPv4}/, but this is because 318.99.183.11 contains a valid IP address, namely 18.99.183.11. To prevent the unwanted matching, one needs to anchor the regexp: /^$RE{net}{IPv4}$/.

For this pattern and the next four, under -keep (See Regexp::Common):

$1

captures the entire match

$2

captures the first component of the address

$3

captures the second component of the address

$4

captures the third component of the address

$5

captures the final component of the address

Returns a pattern that matches a valid IP address in "dotted decimal"

If -sep=P is specified the pattern P is used as the separator. By default P is qr/[.]/.

Returns a pattern that matches a valid IP address in "dotted hexadecimal", with the letters A to F capitalized.

If -sep=P is specified the pattern P is used as the separator. By default P is qr/[.]/. -sep="" and -sep=" " are useful alternatives.

Returns a pattern that matches a valid IP address in "dotted octal"

If -sep=P is specified the pattern P is used as the separator. By default P is qr/[.]/.

Returns a pattern that matches a valid IP address in "dotted binary"

If -sep=P is specified the pattern P is used as the separator. By default P is qr/[.]/.

Returns a pattern that matches a valid MAC or ethernet address as colon separated hexadecimals.

For this pattern, and the next four, under -keep (See Regexp::Common):

$1

captures the entire match

$2

captures the first component of the address

$3

captures the second component of the address

$4

captures the third component of the address

$5

captures the fourth component of the address

$6

captures the fifth component of the address

$7

captures the sixth and final component of the address

This pattern, and the next four, have a subs method as well, which will transform a matching MAC address into so called canonical format. Canonical format means that every component of the address will be exactly two hexadecimals (with a leading zero if necessary), and the components will be separated by a colon.

The subs method will not work for binary MAC addresses if the Perl version predates 5.6.0.

Returns a pattern that matches a valid MAC address as colon separated decimals.

If -sep=P is specified the pattern P is used as the separator. By default P is qr/:/.

Returns a pattern that matches a valid MAC address as colon separated hexadecimals, with the letters a to f in lower case.

If -sep=P is specified the pattern P is used as the separator. By default P is qr/:/.

Returns a pattern that matches a valid MAC address as colon separated octals.

If -sep=P is specified the pattern P is used as the separator. By default P is qr/:/.

Returns a pattern that matches a valid MAC address as colon separated binary numbers.

If -sep=P is specified the pattern P is used as the separator. By default P is qr/:/.

Returns a pattern to match domains (and hosts) as defined in RFC 1035. Under I{-keep} only the entire domain name is returned.

RFC 1035 says that a single space can be a domainname too. So, the pattern returned by $RE{net}{domain} recognizes a single space as well. This is not always what people want. If you want to recognize domainnames, but not a space, you can do one of two things, either use

    /(?! )$RE{net}{domain}/

or use the {-nospace} option (without an argument).

RFC 1035

Mockapetris, P.: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION. November 1987.

Regexp::Common for a general description of how to use this interface.

Damian Conway damian@conway.org.

This package is maintained by Abigail (regexp-common@abigail.be).

Bound to be plenty.

For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be.

This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.

This module is free software, and maybe used under any of the following licenses:

 1) The Perl Artistic License.     See the file COPYRIGHT.AL.
 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
 3) The BSD Licence.               See the file COPYRIGHT.BSD.
 4) The MIT Licence.               See the file COPYRIGHT.MIT.