The "?" in ".*?" makes ".*" matches as few characters as possible. Get rid of it.
Furthermore, the "g" in if (/.../g) makes no sense conceptually (check if there's a match, then check again to be sure?) or in practice (it has weird side effects). Get rid of it.
I dislike using global variables for no reason, so I'd write it
my $page2 = "Account number 12345678";
if ( my ($acct) = $page2 =~ /Account number (.*)/ ) {
print "acct = $acct\n";
}
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