Returning argument as a number problem

Hey guys, I have a method as such:

def random(len)
if len !~ /\d+/
pub_send "Invalid number"
elsif len > 30
pub_send "No more then 30 chars"
else
chars = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a
random = ""
1.upto(len) { |i| newpass << chars[rand(chars.length)] }
pub_send random
end
end

and i call the method like so..

random($1) if $msg =~ /^rand (\d+)/

the value of $1 will always be a number, but it seems when i am passing
it to the function it returns an error saying it cannot compare len to
30 because the value of len is a string... Any ideas?

Thanks in advance
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