ruby on rails - How to validate price in input? -

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i have input (it's text input) users can set price. problem is, users can set price this:

9 9.99 9,99 $9.99

what's best way validate input? running app on heroku (= postgresql database), data type column decimal.

try below. matches examples.

validates :price, :presence => true,             :format => { :with => /^(\$)?(\d+)(\.|,)?\d{0,2}?$/ }

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