从字符串中去除 HTML 标签
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Stripping out HTML tags from a string
提问by Led
How do I remove HTML tags from a string so that I can output clean text?
如何从字符串中删除 HTML 标签，以便可以输出干净的文本？
let str = string.stringByReplacingOccurrencesOfString("<[^>]+>", withString: "", options: .RegularExpressionSearch, range: nil)
print(str)
回答by Steve Rosenberg
Hmm, I tried your function and it worked on a small example:
嗯，我试过你的功能，它在一个小例子上工作：
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. "
Can you give an example of a problem?
你能举一个问题的例子吗？
Swift 4 and 5 version:
Swift 4 和 5 版本：
var string = "<!DOCTYPE html> <html> <body> <h1>My First Heading</h1> <p>My first paragraph.</p> </body> </html>"
let str = string.replacingOccurrences(of: "<[^>]+>", with: "", options: .regularExpression, range: nil)
回答by Joony
Since HTML is not a regular language(HTML is a context-freelanguage), you cannot use Regular Expressions. See: Using regular expressions to parse HTML: why not?
由于 HTML 不是常规语言（HTML 是一种上下文无关语言），因此您不能使用正则表达式。请参阅：使用正则表达式解析 HTML：为什么不呢？
I would consider using NSAttributedString instead.
我会考虑使用 NSAttributedString 代替。
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
Or, as Irshad Mohamed in the comments would do it:
或者，正如 Irshad Mohamed 在评论中所做的那样：
let attributed = try NSAttributedString(data: htmlString.data(using: .unicode)!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
print(attributed.string)
回答by Andrew
Mohamed solution but as a String extension in Swift 4.
Mohamed 解决方案，但作为 Swift 4 中的字符串扩展。
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
}
}
}
回答by Antoine
I'm using the following extension to remove specific HTML elements:
我正在使用以下扩展来删除特定的 HTML 元素：
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
}
}
This makes it possible to only remove <a>tags from a string, e.g.:
这使得仅从<a>字符串中删除标签成为可能，例如：
let string = "my html <a href="">link text</a>"
let withoutHTMLString = string.deleteHTMLTag("a") // Will be "my html link text"
回答by Benny Davidovitz
extension String{
var htmlStripped : String{
return self.replacingOccurrences(of: "<[^>]+>", with: "", options: .regularExpression, range: nil)
}
}
Happy Coding
快乐编码
回答by Logic
swift 4 :
快速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
}
}
回答by Lee Irvine
Updated for Swift 4:
为 Swift 4 更新：
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
