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    <p>I've written a small piece of code that makes the conversion. I think it could be useful to somebody else. I've learned a lot about regex's <a href="http://msdn.microsoft.com/en-us/library/bs2twtah.aspx#balancing_group_definition">balancing goup definitions</a> on the way. </p> <pre><code> public static class RazorConversor { public static void ConvertAll(string directory) { string[] array = Directory.GetFiles(directory, "*.aspx", SearchOption.AllDirectories).Concat( Directory.GetFiles(directory, "*.ascx", SearchOption.AllDirectories)).ToArray(); foreach (var fileName in array) { string aspxCode = File.ReadAllText(fileName); string razorCode = ConvertToRazor(aspxCode); File.WriteAllText(fileName, razorCode); //rename manually to update .csproj &amp; source control } } static readonly string[] DefaultNamespaces = new string[] { "System.Web.Helpers", "System.Web.Mvc", "System.Web.Mvc.Ajax", "System.Web.Mvc.Html", "System.Web.Routing", "System.Web.WebPages", }; public static string ConvertToRazor(string aspxCode) { return ConvertToRazor(aspxCode, DefaultNamespaces); } public static string ConvertToRazor(string aspxCode, string[] defaultNamespaces) { //namespaces string text2 = Regex.Replace(aspxCode, @"&lt;%@\s+Import Namespace=""(?&lt;ns&gt;.*?)""\s+%&gt;", m =&gt; defaultNamespaces.Contains(m.Groups["ns"].Value) ? null : "@using " + m.Groups["ns"].Value); //headers string text3 = Regex.Replace(text2, @"&lt;%@\s(?&lt;dir&gt;.*?)%&gt;", m =&gt; "@{ " + m.Groups["dir"].Value + "}"); // Preserves headers //expressions string text4 = Regex.Replace(text3, @"&lt;%[=:](?&lt;expr&gt;.*?)%&gt;", m =&gt; { string expr = m.Groups["expr"].Value.Trim(); string cleanExpr = Regex.Replace(expr, @"(""(\\""|[^""])*"")|(@""([^""]|"""")*"")|(\([^\(\)]*(((?'Open'\()[^\(\)]*)+((?'Close-Open'\))[^\(\)]*)+)*\))", m2 =&gt; ""); return cleanExpr.Contains(' ') ? "@(" + expr + ")" : "@" + expr; }, RegexOptions.Singleline); //code blocks string text5 = Regex.Replace(text4, @"&lt;%(?&lt;code&gt;.*?)%&gt;", m =&gt; { string code = m.Groups["code"].Value.Trim(); Dictionary&lt;string, string&gt; stringLiterals = new Dictionary&lt;string,string&gt;(); code = Regex.Replace(code, @"(""(\\""|[^""])*"")|(@""([^""]|"""")*"")", m2 =&gt; { string key = "&lt;$" + stringLiterals.Count + "$&gt;"; stringLiterals.Add(key, m2.Value); return key; }); string result = Regex.Replace(code, @"((?&lt;blockHeader&gt;(else|(for|switch|foreach|using|while|if)\s*\([^\(\)]*(((?'Open'\()[^\(\)]*)+((?'Close-Open'\))[^\(\)]*)+)*\))\s*)" + @"((?&lt;fullBlock&gt;{[^{}]*(((?'OpenCurly'{)[^{}]*)+((?'CloseCurly-OpenCurly'})[^{}]*)+)*})|(?&lt;openblock&gt;{.*))|" + @"(?&lt;text&gt;((?!({|}|\s)(for|switch|foreach|using|while|if|else)(\s|{|\()).)+))", m2 =&gt; { if(m2.Value.Trim().Length == 0 || m2.Value.StartsWith("else")|| m2.Value.StartsWith("}")) return m2.Value; if(m2.Groups["text"].Success) return "@{ " + m2.Value.Trim() + "}\r\n"; return "@" + m2.Value; }, RegexOptions.ExplicitCapture | RegexOptions.Singleline); result = Regex.Replace(result, @"&lt;\$\d+\$&gt;", m2 =&gt; stringLiterals[m2.Value]); return result; }, RegexOptions.Singleline); return text5; } } </code></pre>
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    1. POAspx to Razor syntax converter?
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    1. COOf course you've heard the famous quip from Fredrik Lundh: "Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems." Thanks for the utility, can't wait to give it a whirl.
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      1. USMatt Woodard
    2. COI think the world is waiting for a tool that highlights the synthax of regular expressions. In the meenwhile, I think doing that without regular expression will need much much code.
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      1. USOlmo
    3. CO@Olmo: I've had good experience with [RegExr](http://gskinner.com/RegExr/). It's great because it highlights the part of the regex you're hovering over and offers context sensitive help. You might want to give it a try - they also offer a desktop version (which I haven't used, yet).
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