正则表达式剥离锚标签之间的所有内容

Question

I am trying to strip out all the links and text between anchors tags from a html string as below:

 string LINK_TAG_PATTERN = "/<a\b[^>]*>(.*?)<\\/a>";

 htmltext = Regex.Replace(htmltext, LINK_TAG_PATTERN, string.Empty);

This is not working anyone have ideas why?

Thanks a lot,

Edit: the regex was from this link Extract text and links from HTML using Regular Expressions

Answer 1

Use an HTML Parser and not Regular Expressions to parse HTML.

HTML Agiliity Pack

Answer 2

Problems in your string: Unnecessary slash at the beginning (that's Perl syntax), unescaped backslash ( \\b ), unnecessary escaped backslash ( \\\\ ).

So, if it has to be a Regex, taking all warnings into account that enough other people have linked to, try

string LINK_TAG_PATTERN = @"<a\b[^>]*>(.*?)</a>";
htmltext = Regex.Replace(htmltext, LINK_TAG_PATTERN, string.Empty, RegexOptions.IgnoreCase);

The \\b is necessary to prevent other tags that start with a from matching.

Answer 3

I recommend Expresso to troubleshoot regular expressions. You can find a library of regular expressions here .

You might consider using javascript to walk the DOM tree for your replacements instead of regex.

Answer 4

string LINK_TAG_PATTERN = @"(<a\s+[^>]*>)(.*?)(</a>)";

htmltext = Regex.Replace(htmltext, LINK_TAG_PATTERN, "$1$3", RegexOptions.IgnoreCase);

Answer 5

从概念上讲，这仅会剥离非常特殊的链接（例如，您的正则表达式与在HTML中完全有效的大写A不匹配： <A ...>bla</A> 。对于JavaScript链接而言，替换无效也可以，您的代码是否与用户安全相关？