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PO.Net Regex match grouping and repetition question
 

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    <p>I have the following VB.Net 2.0 in an ASP.Net app:</p> <pre><code>output = Regex.Replace(output, "&lt;p&gt;(?:(?:\&lt;\!\-\-.*?\-\-\&gt;)|&amp;(?:nbsp|\#0*160|x0*A0);|&lt;br\s*/?&gt;|[\s\u00A0]+)*&lt;/p&gt;", String.Empty, RegexOptions.Compiled Or RegexOptions.CultureInvariant Or RegexOptions.IgnoreCase Or RegexOptions.Singleline) </code></pre> <p>Example stuff it matches well:</p> <ul> <li><code>&lt;p&gt;&lt;/p&gt;</code></li> <li><code>&lt;p&gt; &lt;/p&gt;</code></li> <li><code>&lt;p&gt;&lt;br/&gt;&lt;br/&gt;&lt;/p&gt;</code></li> <li><code>&lt;p&gt;&lt;!-- comment --&gt;&lt;!-- comment --&gt;&lt;/p&gt;</code></li> <li><code>&lt;p&gt;&amp;nbsp;&amp;nbsp;&lt;/p&gt;</code></li> <li><code>&lt;p&gt;&lt;br/&gt;&amp;nbsp;&lt;/p&gt;</code></li> <li><code>&lt;p&gt;&lt;!-- comment --&gt;&lt;br/&gt;&lt;!-- comment --&gt;&lt;/p&gt;</code></li> <li><code>&lt;p&gt;&amp;nbsp;&lt;br/&gt;&lt;/p&gt;</code></li> </ul> <p>Examples of stuff I'd like to match but it doesn't:</p> <ul> <li><code>&lt;p &gt; &lt;!--[if !supportLineBreakNewLine]--&gt;&lt;br /&gt; &lt;!--[endif]--&gt;&lt;/p&gt;</code></li> </ul> <p>How do I make the groups and repetitions work how I want them to?</p> <p><strong>Edit:</strong> oops, forgot the comment group. <strong>Edit #2:</strong> oops, forgot a fail. <strong>Edit #3:</strong> fixed examples. <strong>Edit #4:</strong> updated regex based on answers</p> <p><strong>Conclusion:</strong></p> <p>Here are my benchmarked results for all three answers. Since all three now match everything I ran each one through 10,000 iterations on a block of text:</p> <pre><code>Mine: &lt;p\s*&gt;(?:(?:&lt;!--.*?--&gt;)|&amp;(?:nbsp|\#0*160|x0*A0);|&lt;br\s*/?&gt;|[\s\u00A0]+)*&lt;/p&gt; 6.312 Gumbo: &lt;p\s*&gt;(?:[\s\u00A0]+|&amp;(?:nbsp|\#0*160|x0*A0);|&lt;br\s*/?&gt;|&lt;!--(?:[^-]+|-(?!-))*--&gt;)*&lt;/p&gt; 6.05 steamer25: &lt;p\s*&gt;(?:(?:\&amp;nbsp\;)|(?:\&amp;\#0*160\;)|(?:&lt;br\s*/?&gt;)|\s|\u00A0|&lt;!\-\-[^(?:\-\-)]*\-\-&gt;)*&lt;/p&gt; 6.121 </code></pre> <p>Gumbo's was the fastest, so I'll mark his as the correct answer.</p>
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    1. COWhat is it you're trying to do?
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    2. COI'm trying to strip all P tags from html content that only contain: html comments, non-breaking spaces, BR elements, or whitespace characters.
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