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POVERY slow running regular expression when using large documents
 

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  1. POVERY slow running regular expression when using large documents
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    <p>I need to convert inline css style attributes to their HTML tag equivelants. The solution I have works but runs VERY slowly using the Microsoft .Net Regex namespace and long documents (~40 pages of html). I've tried several variations but with no useful results. I've done a little wrapping around executing the expressions but in the end it's just the built-in regex Replace method that gets called.</p> <p>I'm sure I'm abusing the greediness of the regex but I'm not sure of a way around it to achieve what I want using a single regex.</p> <p>I want to be able to run the following unit tests:</p> <pre><code>[Test] public void TestCleanReplacesFontWeightWithB() { string html = "&lt;font style=\"font-weight:bold\"&gt;Bold Text&lt;/font&gt;"; html = Q4.PrWorkflow.Helper.CleanFormatting(html); Assert.AreEqual("&lt;b&gt;Bold Text&lt;/b&gt;", html); } [Test] public void TestCleanReplacesMultipleAttributesFontWeightWithB() { string html = "&lt;font style=\"font-weight:bold; color: blue; \"&gt;Bold Text&lt;/font&gt;"; html = Q4.PrWorkflow.Helper.CleanFormatting(html); Assert.AreEqual("&lt;b&gt;Bold Text&lt;/b&gt;", html); } [Test] public void TestCleanReplaceAttributesBoldAndUnderlineWithHtml() { string html = "&lt;span style=\"font-weight:bold; color: blue; text-decoration: underline; \"&gt;Bold Text&lt;/span&gt;"; html = Q4.PrWorkflow.Helper.CleanFormatting(html); Assert.AreEqual("&lt;u&gt;&lt;b&gt;Bold Text&lt;/b&gt;&lt;/u&gt;", html); } [Test] public void TestCleanReplaceAttributesBoldUnderlineAndItalicWithHtml() { string html = "&lt;span style=\"font-weight:bold; color: blue; font-style: italic; text-decoration: underline; \"&gt;Bold Text&lt;/span&gt;"; html = Q4.PrWorkflow.Helper.CleanFormatting(html); Assert.AreEqual("&lt;u&gt;&lt;b&gt;&lt;i&gt;Bold Text&lt;/i&gt;&lt;/b&gt;&lt;/u&gt;", html); } [Test] public void TestCleanReplacesFontWeightWithSpaceWithB() { string html = "&lt;font size=\"10\" style=\"font-weight: bold\"&gt;Bold Text&lt;/font&gt;"; html = Q4.PrWorkflow.Helper.CleanFormatting(html); Assert.AreEqual("&lt;b&gt;Bold Text&lt;/b&gt;", html); } </code></pre> <p>The regular expresion I am using to achieve this logic works but is VERY slow. The regex in the c# code looks like this:</p> <pre><code>public static IReplacePattern IncludeInlineItalicToITag(ICleanUpHtmlFactory factory) { return factory.CreateReplacePattern("(&lt;(span|font) .*?style=\".*?font-style:\\s*italic[^&gt;]*&gt;)(.*?)&lt;/\\2&gt;", "$1&lt;i&gt;$3&lt;/i&gt;&lt;/$2&gt;"); } public static IReplacePattern IncludeInlineBoldToBTag(ICleanUpHtmlFactory factory) { return factory.CreateReplacePattern("(&lt;(span|font) .*?style=\".*?font-weight:\\s*bold[^&gt;]*&gt;)(.*?)&lt;/\\2&gt;", "$1&lt;b&gt;$3&lt;/b&gt;&lt;/$2&gt;"); } public static IReplacePattern IncludeInlineUnderlineToUTag(ICleanUpHtmlFactory factory) { return factory.CreateReplacePattern("(&lt;(span|font) .*?style=\".*?text-decoration:\\s*underline[^&gt;]*&gt;)(.*?)&lt;/\\2&gt;", "$1&lt;u&gt;$3&lt;/u&gt;&lt;/$2&gt;"); } </code></pre>
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    1. COBefore I provide an answer, question: What version of the .NET framework are you using? If you're not currently using .NET 3.5, would this be worth it to upgrade to get?
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      1. USAlex Lyman
 

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