Rails Validator - Only Alphanumeric and not all Numeric
ruby, ruby-on-rails, ruby-on-rails-4, validation
Solution
You can use
validates :user_name, with: /^[A-Za-z0-9]+$/
which accepts only number and digits or you can try Rails format validation -- alphanumeric, but not purely numeric
Problem
I'm trying to get a 'Twitter-like' validation working. That means ``` - Only alphanumeric and not all numeric ``` but I'm stuck at the regexp. Can someone help me out with that specific regular expression? `validates :user_name, with: 'elmagicoregexp'`