CODEWITHSUNDEEP
iosregexswift2xcode7
jose compaq
jose compaq

Reputation: 51

How to use NSRegularExpression in Swift 2.0 in xcode 7

//The error is here let regex = NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: nil, error: nil)

//The error is:***

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

Upvotes: 2

Views: 3470

Answers (3)

ViJay Avhad
ViJay Avhad

Reputation: 2700

NSRegularExpression in Swift 2.0 in xcode 7

 extension String {
     func isEmail() throws -> Bool {
         let regex = try NSRegularExpression(pattern: "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}$", options: [.CaseInsensitive])

        return regex.firstMatchInString(self, options: NSMatchingOptions(rawValue: 0), range: NSMakeRange(0, characters.count)) != nil
}
}

Then when you want to call the method, do it from within a do block and catch the error that comes out.

do {
      try "[email protected]".isEmail()
   } catch {
      print(error)
   }

Upvotes: 1

Code Different
Code Different

Reputation: 93151

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.

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)
}

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

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

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

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

Upvotes: 10

Long Pham
Long Pham

Reputation: 7582

In Swift2. You need use do try catch for error handling.

do {
    let regex = try NSRegularExpression(pattern: "(<img.*?src=\")(.*?)(\".*?>)", options: NSRegularExpressionOptions.CaseInsensitive)
}catch {
// Handling error
}

Upvotes: 2

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