从字符串中剥离HTML标记
从字符串中剥离HTML标记
提问于 2014-09-23 05:42:11
如何从字符串中删除HTML标记，以便可以输出干净的文本？
let str = string.stringByReplacingOccurrencesOfString("<[^>]+>", withString: "", options: .RegularExpressionSearch, range: nil)
print(str)回答 8
Stack Overflow用户
回答已采纳
发布于 2014-09-23 06:34:42
嗯，我试过你的函数，它在一个小例子中起作用：
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. "你能举一个问题的例子吗？
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)Stack Overflow用户
发布于 2015-12-28 16:48:04
因为超文本标记语言不是regular language (超文本标记语言是一种context-free语言)，所以不能使用正则表达式。请参阅：Using regular expressions to parse HTML: why not?
我会考虑改用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或者，正如伊尔沙德·穆罕默德在评论中所说的那样：
let attributed = try NSAttributedString(data: htmlString.data(using: .unicode)!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
print(attributed.string)Stack Overflow用户
发布于 2019-01-30 19:23:12
穆罕默德解决方案，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
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25983558
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