ruby - Trying to add validation to rails devise sign-up page -

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kinda noob rails programmer, save me ton of headache. currently, i'm trying add validation devise sign on page, such allowing sign complete if email ends extension. know file location stands overlooks sign on page? i've looked on models , views can't seem find it. thank you!

i think can use validates_format_of in user.rb model. can use rubular.com create regex.

validates_format_of :email, :with => /myregexhere/

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