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copied!<p>You can try this sample:</p> <pre><code>string fileName = @"X:\Users\username\AppData\Local\foo.txt"; Console.Write(Regex.Replace(fileName, @"([A-Z]{1}\:*\\Users\\)(\w+\\)(.*)", "$1$3")); </code></pre> <p>Explanation:</p> <ol> <li><code>([A-Z]{1}\:\\[Uu]sers\\)</code> - this part of Regex is a first group of characters, before the <code>username</code>, in the path<br> <ul> <li><code>^</code> stands for the start of the line <strong>(remove this to ignore words preceding the filename)</strong> </li> <li><code>[A-Z]{1}\:\\</code> stands for the disk root path. You can choose the disk letters you want to be here, like this: <code>[CDX-Z]{1}</code>. Note <code>{1}</code> - this is constraint means you need only 1 uppercase letter.</li> <li><code>[Uu]sers\\</code> stands for the users directory name, note the group for the case-insensitive users path This is first group, refered as <code>$1</code> in the replace pattern </li> </ul></li> <li><code>(\w+\\)</code> - this part of Regex is a second group of characters, the <code>username</code>, in the path <ul> <li><code>\w+\\</code> stands for at least one word character and <code>\</code> sign. This is a second group, which is not in a replace pattern </li> </ul></li> <li><code>(.*)</code> - this part of Regex is a third group of characters, after the <code>username</code>, in the path<br> <ul> <li><code>.*</code> stands for any character after the removed <code>\</code> symbol.</li> </ul></li> </ol> <p>Update: In the real world I found usernames with spaces, unicode chars and ~ in it. So I replaced the 2. group to include any characters but the <code>\</code> sign.</p> <pre><code>string fileName = @"X:\Users\username\AppData\Local\foo.txt"; Console.Write(Regex.Replace(fileName, @"([A-Z]{1}\:\\[Uu]sers\\)([^\\]*\\)(.*)", "$1$3")); </code></pre>

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