CODEWITHSUNDEEP
rubyvalidation
Bilberryfm
Bilberryfm

Reputation: 537

Currency validation for input Ruby

I am new to Ruby. I have lines like this, asking a user to enter amount of money:

puts "Enter amount of money in $:"
goal = gets.chomp.to_f

How could I easily check if the user entered the correct amount in dd:cc format. Like 7.05 or 16.55 (excluding options like 45.343434).

Upvotes: 2

Views: 1368

Answers (2)

Sagar Pandya
Sagar Pandya

Reputation: 9508

This accepts any number with two decimal places.

#file.rb
puts 'enter amount in dollars'
amount = gets.chomp
r = /^\d+\.\d\d$/

unless amount.match r
 puts 'incorrect format, please try again'
end

Example

$ ruby file.rb
enter amount in dollars
444.884
incorrect format, please try again

Upvotes: 2

Fred
Fred

Reputation: 8602

Match your input string against the pattern you require. One example regular expression: optional leading negative, optional $, optional comma separation, mandatory two digit fraction of a dollar:

^\-?\$?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$

You can make simpler regular expressions. I recommend using an interactive tool like Rubular to play around and learn more about regular expressions.

Upvotes: 0

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