去除所有的HTML标签，除了链接 [英] Strip all HTML tags except links

问题描述

我试图写一个正EX pression剥离所有HTML除链接（在＆LT; A HREF 和 ＆LT; / A＆GT; 分别标记它不必是100％安全（我不担心注入式攻击或任何东西，因为我解析已被批准并公布到<内容HREF =htt​​p://en.wikipedia.org/wiki/SWF> SWF 电影）。

原来带标签常规EX pression我使用的是＆LT; | + GT（\名词）; ，我试图修改为≤（[^ A] | \ n）的+＆GT; ，但当然会允许有一个 在它，而不是一个有它在开始时，用一个空格。

不，应该真正的问题，但如果有人在乎知道我写这的ActionScript 3.0 的一个闪存的影片。

解决方案

 ≤（\ / A（=＆GT; |？！？\ S *＆GT;）。）\ /?.*?>
 

试试这个。也有类似的p标签的东西。为他们的工作所以不明白为什么不能。使用负向前查找，以检查它不匹配（prefixed具有可选/字符），其中（使用正向前查找）一个（使用可选/ preFIX），之后是>或空格，东西，然后>。这就匹配，直到下一个>字符。将这个在SUBST与

  S /＆LT;？。？（\ / A（=＆GT; |？！？\ S *＆GT;））\ / *＆GT; //克;
 

这应该只留下打开和关闭标签

I am trying to write a regular expression to strip all HTML with the exception of links (the <a href and </a> tags respectively. It does not have to be 100% secure (I am not worried about injection attacks or anything as I am parsing content that has already been approved and published into a SWF movie).

The original "strip tags" regular expression I'm using was <(.|\n)+?>, and I tried to modify it to <([^a]|\n)+?>, but that of course will allow any tag that has an a in it rather than one that has it in the beginning, with a space.

Not that it should really matter, but in case anyone cares to know I am writing this in ActionScript 3.0 for a Flash movie.

解决方案

<(?!\/?a(?=>|\s.*>))\/?.*?>

Try this. Had something similar for p tags. Worked for them so don't see why not. Uses negative lookahead to check that it doesn't match a (prefixed with an optional / character) where (using positive lookahead) a (with optional / prefix) is followed by a > or a space, stuff and then >. This then matches up until the next > character. Put this in a subst with

s/<(?!\/?a(?=>|\s.*>))\/?.*?>//g;

This should leave only the opening and closing a tags

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