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c:\@Work\Perl\monks>perl -wMstrict -le
"my %rx = ( 2 => 'Oops...' );
...
 print $ry;
"
(?msx-i: (?msx-i: \b foo \b ){2} X Oops... Y (?:(?msx-i: \b foo \b )){
+2} )

c:\@Work\Perl\monks>perl -wMstrict -le
"use Regexp::Common qw(net);
...
 print 'match B' if '99999.9.9.99999' =~ $ipv4_B;
"
match A

my $octet = qr{ \d+ }xms;
my $ipv4  = qr{ \b $octet (?: [.] $octet){3} \b }xms;