Regex validation in rails

Question

I am new with rails and I am trying to register my user's names without special characters and spaces but allowing the - symbol.

Example : 
@@Pierre! => invalid
Pierre-Louis => valid
Pierre Louis => invalid

In the User.rb file I have :

class User < ApplicationRecord
...
validates :first_name, presence: true, length: {maximum: 25}, format: {with: Regexp.new('[^0-9A-Za-z-]')}
...

I don't have any error message and I'm still able to register using special characters.

Also, I'd like to add an error message if the name isn't validated.

Do you have any leads ?

Any help would be much appreciated !

mrzasa · Accepted Answer · 2019-01-18 16:30:10Z

1

When you validate format with regex, you need to ensure you match the whole string that is being validated. In order to do that your regex needs to start with \A and end with \z that are anchors marking beginning and ending of the string.

In your case:

validates :first_name, 
  presence: true, 
  length: {maximum: 25}, 
  format: {with: /\A[-0-9A-Za-z]\z'/}
  message: "Custom message"

assuming you accept numbers, small and big letters and a minus sign.

edited Jan 18, 2019 at 16:30

answered Jan 18, 2019 at 16:24

mrzasa

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mrzasa Over a year ago

With :message option: edgeguides.rubyonrails.org/…

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