^, $ in Rails regular expression


Check zip code with regular expression

Implementation with error


class User < ActiveRecord::Base
  validates :zip_code, format: { with: /^\d{3}\-?\d{4}$/ }

Now when I run the application I get the following error:

The provided regular expression is using multiline anchors (^ or $), which may present a security risk. Did you mean to use \A and \z, or forgot to add the :multiline => true option?

Because there is a security risk

--^ at the beginning of the line is \ A -- $ at the end of the line is `` `\ z

I was told to use.

Modified implementation


class User < ActiveRecord::Base
  validates :zip_code, format: { with: /\A\d{3}\-?\d{4}\z/ }

Now the error is gone.

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