RoR 4 中带有验证的正则表达式 [英] Regular expressions with validations in RoR 4

问题描述

有如下代码:

class Product < ActiveRecord::Base
  validates :title, :description, :image_url, presence: true
  validates :price, numericality: {greater_than_or_equal_to: 0.01}
  validates :title, uniqueness: true
  validates :image_url, allow_blank: true, format: {
      with: %r{.(gif|jpg|png)$}i,
      message: 'URL must point to GIT/JPG/PNG pictures'
  }
end

它可以工作，但是当我尝试使用rake test"对其进行测试时，我会收到以下消息:

It works, but when I try to test it using "rake test" I'll catch this message:

rake aborted!
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?

这是什么意思?我该如何解决?

What does it mean? How can I fix it?

推荐答案

^ 和 $ 是 Start of Line 和 End 线锚.而 A 和 z 是永久开始 字符串 和结束 字符串 锚点.
看看区别:

^ and $ are Start of Line and End of Line anchors. While A and z are Permanent Start of String and End of String anchors.
See the difference:

string = "abcde
zzzz"
# => "abcde
zzzz"

/^abcde$/ === string
# => true

/Aabcdez/ === string
# => false

所以 Rails 告诉你，你确定要使用 ^ 和 $ 吗?你不想使用 A 和 z 代替?"

So Rails is telling you, "Are you sure you want to use ^ and $? Don't you want to use A and z instead?"

这里还有更多关于 Rails 安全问题的信息.

There is more on the rails security concern that generates this warning here.

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