Question

I’m trying to use a regular expression as a condition inside (until) loop.
basically, It’s for entering numeric password..

I tried this code

   print "Password: "
   x = gets.chomp.to_i
   until (/^[\d]+(\.[\d]+){0,1}$/ === "#{x}") == "true"
      print "Only numbers allowed, Password: "
      x = gets.chomp.to_i
   end

but unfortunately it didn’t work.

Any ideas?

Answer 1

You shouldn’t compare to the string "true". In fact in Ruby you barely ever should need to explicitly compare to true or false, since that’s what boolean expressions evaluate to. Also note that to_i probably does not do what you expect:

"adsfasf34".to_i #=> 0
"1adsfasf34".to_i #=> 1

What you can do is something like this:

print "Password: "
until (x = gets.chomp) =~ /^[\d]+(\.[\d]+){0,1}$/
  print "Only numbers allowed, Password: "
end
x = x.to_i