Formfield在Rspec中应该有4个数字，后跟2个字母

本文介绍了Formfield在Rspec中应该有4个数字，后跟2个字母的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在编写一个用户可以在其中填写邮政编码的应用程序。在荷兰，邮政编码的格式是数字的4倍，后跟2个字母。例如，1234AB。

I am writing an application where a user could fill in their zipcode. In the Netherlands a zipcode has a format of 4 times a number, followed by 2 letters. For example, 1234AB.

在我的测试中，我到目前为止已经写过：

In my test I have written so far:

before(:each) do @zipcode = Zipcode.new @zipcode.zipcode = "1234AB" @zipcode.house_number = 2 end it "should have a valid zipcode" do @zipcode.zipcode.should_not be_empty @zipcode.zipcode.should be_a(String) @zipcode.zipcode.length.should == 6 end

我如何编写测试以检查是否存在4数字后跟2个字母？以及我应该如何在代码本身中写出来呢？

How ca I write the test that it checks if there are 4 numbers followed by 2 letters? And how should I write that in code it self?

推荐答案

您将要使用正则表达式（正则表达式）。对于您的示例，这将非常简单：

You will want to use a Regex (regular expression). For your example, it would be quite simple:

/\A[0-9]{4}[A-Z]{2}\z/

表示：行首，数字4次，2

（我知道，如果您不熟悉该概念，这看起来可能并不简单，但请继续阅读它会很快变得清晰起来。我建议您在Ruby上下文中阅读正则表达式，以了解Ruby正则表达式的所有怪癖（如果您还没有的话）。）

(I know this might not look simple if you're not familiar with the concept, but just read up on it and it will become clear very quickly. I recommend to read up on regexes in a Ruby context to know about all the quirks of Ruby regular expressions if you don't already.)

要在规范中使用此正则表达式，我认为您可以使用以下代码：

To use this regex inside your spec, I think you can use the following:

@zipcode.zipcode.should match(/\A[0-9]{4}[A-Z]{2}\z/)

要使用它在模型中实际验证此格式，请使用此：

To use it to actually validate this format inside your model, use this:

validates :zipcode, format: /\A[0-9]{4}[A-Z]{2}\z/