Validating number using Ruby Regex -


working on rails project requires me validate number (representing day of month) either 1 or 15. placed following validation @ top of model:

validates :deposit_date, presence: true, format: { with: /\a1(5)?\z/ }

the regex works intended when use irb or online testers, fails validation in rails app. number being passed string, don't think it's type issue.

update: thank of relevent answers quickly. able track down issue... data in db invalid, causing seperate save! call fail ;)

try removing capture of 5. 

{ with: /\a15?\z/ }

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