boo_radley's solution is intriguing:
unless ($num =~ /^\d{5,}/ && $num !~/\w/)
According to
Robert's Perl Tutorial "The \w construct actually means 'word' - equivalent to a-zA-Z_0-9"
Because \w includes digits it looks as if this regex might reject all numbers. I tried out the following code here:
my $num = "123456";
unless ($num =~ /^\d{5,}/ && $num !~/\w/) {
print p("Sorry, $num does not match the regex");
} else
{print p("$num matched")};
and sure enough the number 123456 did not match the regex.
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