将具有特殊字符的String分隔为数组

so I'm learning how to use JSON by doing a Blogger Reader App. I want to show in a table the image that it's inside of the blog entry, so when I download the code I have something like this:

所以我正在学习如何使用Blogger Reader App来使用JSON。我想在表格中显示它在博客条目中的图像，所以当我下载代码时，我有这样的东西：

"content = "<div style=\"font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; margin-bottom: 15px; padding: 0px; text-align: justify;\">\nLorem ipsum dolor sit amet, Donec posuere nibh egestas fermentum consequat.</div>\n<div style=\"font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; margin-bottom: 15px; padding: 0px; text-align: justify;\">\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://1.bp.blogspot.com/-HrIjp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s1600/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" data-original-height=\"1179\" data-original-width=\"1600\" height=\"235\" src=\"https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s320/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" width=\"320\" /></a></div>\n<br />\n<br />\nAliquam sed neque sit amet dolor sagittis maximus."

And I need the address of the image, so I tried to simulate in playground by using this code:

我需要图像的地址，所以我尝试使用以下代码在游乐场中进行模拟：

let string = "<image is at: href=\u{5C}\u{22}https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s1600/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" data-original-height=\"1179\" data-original-width=\"1600\" height=\"235\" src=\"https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s320/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" width=\"320\" /></a></div>\n<br />\n<br />\nAliquam sed neque sit amet dolor sagittis maximus."

let stringInit = string 
let stringOperation = NSString(string: stringInit)
let stringArray = stringOperation.components(separatedBy: "href=\u{5C}\u{22}")
let intermediateTwo = stringArray[1]
let operationTwo = NSString(string: intermediateTwo)
let strinArrayTwo = operationTwo.components(separatedBy: ".png")

let image = strinArrayTwo[0] + ".png"

And it worked fine, but when I tried to use it in my app, it crashed because stringArray had just one element. I changed this line:

它工作正常，但当我尝试在我的应用程序中使用它时，它崩溃了因为stringArray只有一个元素。我更改了这一行：

 let stringArray = stringOperation.components(separatedBy: "href=\u{5C}\u{22}")

to:

至：

let stringArray = stringOperation.components(separatedBy: "href=")

And it works properly, I guess it worked in PlayGround because I had to enter the data the same way I'm looking for it, but I really don't know what else to try, so my question is, is there any way to make it work properly?

并且它工作正常，我猜它在PlayGround中工作，因为我必须以我正在寻找的方式输入数据，但我真的不知道还有什么可以尝试，所以我的问题是，有什么方法可以让它正常工作？

Thanks

谢谢

1 个解决方案

#1

I'm not sure how you detected your content, if it's taken from JSON text directly, the head should be "content":, not "content =.

我不确定你是如何检测到你的内容的，如果它是直接从JSON文本中获取的，那么头部应该是“内容”：而不是“content =。

But anyway, it's actual content seems to be represented in a escaped format. (JSON text uses such format to represent JSON string, as well as debug output of Swift String.)

但无论如何，它的实际内容似乎以转义格式表示。（JSON文本使用这种格式来表示JSON字符串，以及Swift String的调试输出。）

And when such escaped format representation is read into Swift String, some escaping sequence such as \" is read as a single character ".

当这种转义格式表示被读入Swift String时，一些转义序列如\“被读作单个字符”。

So, when you replace some part of the String into unicode escaped representation, you need to replace \" into \u{22}, not \u{5c}\u{22}.

因此，当您将String的某些部分替换为unicode转义表示时，您需要将\“替换为\ u {22}，而不是\ u {5c} \ u {22}。

Also you should always check the result of components(separatedBy:) to avoid crashing with unexpected result.

此外，您应该始终检查组件的结果（separatedBy :)以避免意外结果崩溃。

So, your code should be something like this:

所以，你的代码应该是这样的：

let string = "<image is at: href=\u{22}https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s1600/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" data-original-height=\"1179\" data-original-width=\"1600\" height=\"235\" src=\"https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s320/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png\" width=\"320\" /></a></div>\n<br />\n<br />\nAliquam sed neque sit amet dolor sagittis maximus."

let stringArray = string.components(separatedBy: "href=\u{22}")
if stringArray.count > 1 {
    let intermediateTwo = stringArray[1]
    let strinArrayTwo = intermediateTwo.components(separatedBy: ".png")

    if strinArrayTwo.count > 1 {
        let image = strinArrayTwo[0] + ".png"
    } else {
        print("'.png' not found")
    }
} else {
    print("'href=' not found")
}

But you should better consider using regular expression to extract substrings with this sort of pattern.

但是你最好考虑使用正则表达式来提取这种模式的子串。

let pattern = "href=\"(.*?\\.png)\""
let regex = try! NSRegularExpression(pattern: pattern)
if let match = regex.firstMatch(in: string, options: [], range: NSRange(0..<string.utf16.count)) {
    let image = (string as NSString).substring(with: match.rangeAt(1))
    print(image) //->https://1.bp.blogspot.com/-HrI-jp5LBMk/WY5LjP7uiHI/AAAAAAAAAAo/54UtLmw3_oQFmqyhBgfLO9VUV5hSDIBlQCLcBGAs/s1600/Captura%2Bde%2Bpantalla%2B2017-08-11%2Ba%2Bla%2528s%2529%2B19.26.54.png
} else {
    print("'href=...png' not found")
}

#1