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    <p>Here's how we do it. Note that there are probably more edge conditions than you realize at first glance.</p> <p>This is the second version, unrolled for 5x more performance (and yes, I benchmarked it). I figured I'd optimize it because this function can be called hundreds of times per page.</p> <pre><code>/// &lt;summary&gt; /// Produces optional, URL-friendly version of a title, "like-this-one". /// hand-tuned for speed, reflects performance refactoring contributed /// by John Gietzen (user otac0n) /// &lt;/summary&gt; public static string URLFriendly(string title) { if (title == null) return ""; const int maxlen = 80; int len = title.Length; bool prevdash = false; var sb = new StringBuilder(len); char c; for (int i = 0; i &lt; len; i++) { c = title[i]; if ((c &gt;= 'a' &amp;&amp; c &lt;= 'z') || (c &gt;= '0' &amp;&amp; c &lt;= '9')) { sb.Append(c); prevdash = false; } else if (c &gt;= 'A' &amp;&amp; c &lt;= 'Z') { // tricky way to convert to lowercase sb.Append((char)(c | 32)); prevdash = false; } else if (c == ' ' || c == ',' || c == '.' || c == '/' || c == '\\' || c == '-' || c == '_' || c == '=') { if (!prevdash &amp;&amp; sb.Length &gt; 0) { sb.Append('-'); prevdash = true; } } else if ((int)c &gt;= 128) { int prevlen = sb.Length; sb.Append(RemapInternationalCharToAscii(c)); if (prevlen != sb.Length) prevdash = false; } if (i == maxlen) break; } if (prevdash) return sb.ToString().Substring(0, sb.Length - 1); else return sb.ToString(); } </code></pre> <p>To see the previous version of the code this replaced (but is functionally equivalent to, and 5x faster), view revision history of this post (click the date link).</p> <p>Also, the <code>RemapInternationalCharToAscii</code> method source code can be found <a href="https://meta.stackexchange.com/a/7696">here</a>.</p>
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    1. POHow does Stack Overflow generate its SEO-friendly URLs?
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    1. USJeff Atwood
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    1. POHow does Stack Overflow generate its SEO-friendly URLs?
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    1. COIt would be nice with a version that doesn't just drop accented characters like åäö but instead deaccentuate them to aao... ^^
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      1. USOskar Duveborn
    2. CO@oskar the stub of that `RemapInternationalCharToAscii()` function is there http://meta.stackexchange.com/questions/7435/non-us-ascii-characters-dropped-from-full-profile-url/7696#7696
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    3. COThis is great. The only change I have made so far is to change "if (i == maxlen) break;" to become "if (sb.Length == maxlen) break;" just in case there are lots of invalid characters in the string I am passing in.
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      1. USTom Chantler
 

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