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Supprimer les balises HTML d'une chaîne

Comment puis-je supprimer les balises HTML d'une chaîne pour pouvoir imprimer du texte en clair?

let str = string.stringByReplacingOccurrencesOfString("<[^>]+>", withString: "", options: .RegularExpressionSearch, range: nil)
print(str)
htmliosswift
83
Led

Hmm, j'ai essayé votre fonction et cela a fonctionné sur un petit exemple:

var string = "<!DOCTYPE html> <html> <body> <h1>My First Heading</h1> <p>My first paragraph.</p> </body> </html>"
let str = string.stringByReplacingOccurrencesOfString("<[^>]+>", withString: "", options: .RegularExpressionSearch, range: nil)
print(str)

//output "  My First Heading My first paragraph. "

Pouvez-vous donner un exemple de problème?

131
Steve Rosenberg

Étant donné que HTML n'est pas un langage normal (HTML est un sans contexte langage), vous ne pouvez pas utiliser d'expressions régulières. See: tilisation d'expressions régulières pour analyser HTML: pourquoi pas?

Je considérerais plutôt d'utiliser NSAttributedString.

let htmlString = "LCD Soundsystem was the musical project of producer <a href='http://www.last.fm/music/James+Murphy' class='bbcode_artist'>James Murphy</a>, co-founder of <a href='http://www.last.fm/tag/dance-punk' class='bbcode_tag' rel='tag'>dance-punk</a> label <a href='http://www.last.fm/label/DFA' class='bbcode_label'>DFA</a> Records. Formed in 2001 in New York City, New York, United States, the music of LCD Soundsystem can also be described as a mix of <a href='http://www.last.fm/tag/alternative%20dance' class='bbcode_tag' rel='tag'>alternative dance</a> and <a href='http://www.last.fm/tag/post%20punk' class='bbcode_tag' rel='tag'>post punk</a>, along with elements of <a href='http://www.last.fm/tag/disco' class='bbcode_tag' rel='tag'>disco</a> and other styles. <br />"    
let htmlStringData = htmlString.dataUsingEncoding(NSUTF8StringEncoding)!
let options: [String: AnyObject] = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding]
let attributedHTMLString = try! NSAttributedString(data: htmlStringData, options: options, documentAttributes: nil)
let string = attributedHTMLString.string

Ou, comme le ferait Irshad Mohamed dans les commentaires:

let attributed = try NSAttributedString(data: htmlString.data(using: .unicode)!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
print(attributed.string)
23
Joony

Mohamed mais en tant qu'extension de chaîne dans Swift 4.

extension String {

    func stripOutHtml() -> String? {
        do {
            guard let data = self.data(using: .unicode) else {
                return nil
            }
            let attributed = try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
            return attributed.string
        } catch {
            return nil
        }
    }
}
8
Andrew

J'utilise l'extension suivante pour supprimer des éléments HTML spécifiques:

extension String {
    func deleteHTMLTag(tag:String) -> String {
        return self.stringByReplacingOccurrencesOfString("(?i)</?\(tag)\\b[^<]*>", withString: "", options: .RegularExpressionSearch, range: nil)
    }

    func deleteHTMLTags(tags:[String]) -> String {
        var mutableString = self
        for tag in tags {
            mutableString = mutableString.deleteHTMLTag(tag)
        }
        return mutableString
    }
}

Cela permet de ne supprimer que <a> balises d'une chaîne, par exemple:

let string = "my html <a href="">link text</a>"
let withoutHTMLString = string.deleteHTMLTag("a") // Will be "my  html link text"
7
Antoine

Swift 4:

extension String {
    func deleteHTMLTag(tag:String) -> String {
        return self.replacingOccurrences(of: "(?i)</?\(tag)\\b[^<]*>", with: "", options: .regularExpression, range: nil)
    }

    func deleteHTMLTags(tags:[String]) -> String {
        var mutableString = self
        for tag in tags {
            mutableString = mutableString.deleteHTMLTag(tag: tag)
        }
        return mutableString
    }
}
3
Logic

Mis à jour pour Swift 4:

guard let htmlStringData = htmlString.data(using: .unicode) else { fatalError() }

let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [
                .documentType: NSAttributedString.DocumentType.html
                .characterEncoding: String.Encoding.unicode.rawValue
             ]

let attributedHTMLString = try! NSAttributedString(data: htmlStringData, options: options, documentAttributes: nil)
let string = attributedHTMLString.string
2
Lee Irvine
extension String{
    var htmlStripped : String{
        return self.replacingOccurrences(of: "<[^>]+>", with: "", options: .regularExpression, range: nil)
    }
}

Codage heureux

1
Benny Davidovitz