如何在Xcode 7中的Swift 2.0中使用NSRegularExpression [英] How to use NSRegularExpression in Swift 2.0 in xcode 7

问题描述

//错误在这里let regex = NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: nil, error: nil)

//错误是:***

找不到nsregularexpression类型的初始化程序，该初始化程序接受 类型的参数(模式:字符串，ption:无，错误:无)

cannot find an initializer for type nsregularexpression that accept an argument of type (pattern: string,ption:nil,error:nil)

推荐答案

在Swift 2.0中，语法有2处更改:(1)将调用包装在try ... catch块中，而不是提供error范围;和(2)options应该是Set，而不是各个选项的数字or.

There are 2 changes with regards to the syntax in Swift 2.0: (1) you wrap the call in a try ... catch block instead of supplying an error parameter; and (2) options should be a Set, not a numerical or of the individual options.

在您的情况下，代码应如下所示:

In your case the code should look like this:

do {
    let regex = try NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: [])
} catch let error as NSError {
    print(error.localizedDescription)
}

如果您知道自己的模式总是成功，则可以这样缩短它:

If you know that your pattern always succeeds, you can shorten it like this:

let regex = try! NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: [])

现在，如果要为图案设置选项，则可以执行以下操作:

Now if you want to set options to your pattern, you can do this:

let regex = try! NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: [.CaseInsensitive, .AnchorsMatchLines])

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