Question

I would like to write custom validator like i`m trying below

ActiveRecord::Base.class_eval do
  def self.validates_characters(*attr_names)
    validates_each(attr_names) do |record, attr_name, value|
      unless value.nil?
        regex = /^[[a-zA-Z\][0-9]\]]\\$@^`,|%;.~()\/{}:?\[=\]\+\-_#!<&\s]*$/
        record.errors.add(attr_name, 'invalid characters') unless regex.match(value)
      end
    end
  end
end

I tried this regex => /^[[a-zA-Z\][0-9]\]]\\$@^`,|%;.~()\/{}:?\[=\]\+\-_#!<&\s]*$/ in rubular but it have some errors.

I would like to allow only for this characters:

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567890
$@^`,|%;.~()/\{}:?[]=-+_#!<>& and spaces

So this string is not valid => " © gfdgfd 0543"

Is better way to do this??

Answer 1

If you only want to match those characters you could just use this:

[\$@\^`,\|%;\.~\(\)/\\\{\}:\?=\-\+_#!<>&\sA-Z0-9\[\]]+$