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module LoginFormatValidation
extend ActiveSupport::Concern
included do
# Have multiple regular expression validations so we can get specific error messages:
validates :login,
:format => { :with => /\A.{2,}\z/,
:message => "Login must have at least two characters"}
validates :login,
:format => { :with => /\A[a-z\d_\.-]+\z/,
:message => "Only lowercase letters, digits, . - and _ allowed."}
validates :login,
:format => { :with => /\A[a-z].*\z/,
:message => "Login must begin with a lowercase letter"}
validates :login,
:format => { :with => /\A.*[a-z\d]\z/,
:message => "Login must end with a letter or digit"}
end
end
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