iOS：Strip< img ...>来自NSString（一个html字符串） [英] iOS: Strip <img...> from NSString (a html string)

问题描述

因此，我有一个 NSString ，它基本上是一个 html 字符串，其中所有通常的 html 元素。我想要做的具体事情是将其从所有 img 标签中剥离。
img 标签可能有或没有最大宽度，样式或其他属性，所以我不知道它们的长度。他们总是以 /> gt结尾

我怎么能这样做？

编辑：基于 nicolasthenoz 的答案，我提出了一个需要较少代码的解决方案：

  NSString * HTMLTagss = @< img [^> *>; //正则表达式去除img标签
 NSString * stringWithoutImage = [htmlString stringByReplacingOccurrencesOfRegex：HTMLTagss withString：@]; 
  

解决方案

您可以使用 NSString 方法 stringByReplacingOccurrencesOfString 与 NSRegularExpressionSearch 选项：

  NSString * result = [html stringByReplacingOccurrencesOfString：@< img [^>] *> withString：@选项：NSCaseInsensitiveSearch | NSRegularExpressionSearch范围：NSMakeRange（0，[html length]）]; 
  

或者您也可以使用 replaceMatchesInString NSRegularExpression 的方法。因此，假设你的html在 NSMutableString * html 中，你可以：



  NSRegularExpression * regex = [NSRegularExpression regularExpressionWithPattern：@< img [^>]> 
 options：NSRegularExpressionCaseInsensitive 
 error：nil]; 
 
 [regex replaceMatchesInString：html 
 options：0 
 range：NSMakeRange（0，html.length）
 withTemplate：@]; 
  

我个人倾向于通过 stringByReplacingOccurrencesOfRegex code> RegexKitLite 的方法。没有必要为这样简单的事情引入第三方库，除非有其他引人注目的问题。

So I have an NSString which is basically an html string with all the usual html elements. The specific thing I would like to do is to just strip it from all the img tags. The img tags may or may not have max-width, style or other attributes so I do not know their length up front. They always end with />

How could I do this?

EDIT: Based on nicolasthenoz's answer, I came up with a solution that requires less code:

NSString *HTMLTagss = @"<img[^>]*>"; //regex to remove img tag
NSString *stringWithoutImage = [htmlString stringByReplacingOccurrencesOfRegex:HTMLTagss withString:@""]; 

解决方案

You can use the NSString method stringByReplacingOccurrencesOfString with the NSRegularExpressionSearch option:

NSString *result = [html stringByReplacingOccurrencesOfString:@"<img[^>]*>" withString:@"" options:NSCaseInsensitiveSearch | NSRegularExpressionSearch range:NSMakeRange(0, [html length])];

Or you can also use the replaceMatchesInString method of NSRegularExpression. Thus, assuming you have your html in a NSMutableString *html, you can:

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"<img[^>]*>"
                                                                       options:NSRegularExpressionCaseInsensitive
                                                                         error:nil];

[regex replaceMatchesInString:html
                      options:0
                        range:NSMakeRange(0, html.length)
                 withTemplate:@""];

I'd personally lean towards one of these options over the stringByReplacingOccurrencesOfRegex method of RegexKitLite. There's no need to introduce a third-party library for something as simple as this unless there was some other compelling issue.

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