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    <p>You can use do this pattern:</p> <pre><code>/u/\w* </code></pre> <p>It will match the string <code>/u/</code> followed by zero or more letters, numbers, or underscores. To ensure that the string consists only of this pattern, use start (<code>^</code>) and end (<code>$</code>) anchors, like this:</p> <pre><code>^/u/\w*$ </code></pre> <p>For example:</p> <pre><code>string result = Regex.Match(input, @"^/u/\w*$").Value; </code></pre> <hr> <p>If you're trying to do some special parsing of HTML, I'm afraid regular expressions are a pretty bad option. You really should find some way of properly parsing the document first. Nevertheless, here's a <em>very</em> crude pattern that will ignore this sequence if it happens to be within inside an <code>href</code> attribute (it also assumes the attribute value will be surrounded by quotation marks):</p> <pre class="lang-none prettyprint-override"><code>(?&lt;!href="[^"]*)/u/\w* </code></pre> <p>For example: </p> <pre><code>string input = @"&lt;a href=""http://x/u/foo""&gt;/u/bar&lt;/a&gt;"; string pattern = @"(?&lt;!href=""[^""]+)/u/\w*"; string Regex.Match(input, pattern).Value; // will match /u/bar but not /u/foo </code></pre> <hr> <p>This pattern will match any sequence that doesn't have a word character (letter, number, or underscore), quote, or forward slash in front of it: </p> <pre class="lang-none prettyprint-override"><code>(?&lt;![\w""/])/u/\w* </code></pre> <p>This example shows how it can be used get all matches from the string:</p> <pre><code>var input = @"/u/username /u/username this is this/is/u/user &lt;a href=""http://www.regex.com/u/something/"" /&gt;"; var pattern = @"(?&lt;![\w""/])/u/\w*"; foreach(Match match in Regex.Matches(input, pattern)) { System.Console.WriteLine(match.Value); } </code></pre> <p>The output will me:</p> <pre><code>/u/username /u/username </code></pre>
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    1. PORegular Expression to match /u/{word or underscore or numbers}
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    1. USp.s.w.g
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    1. COThis matches it in any way possible. It also matches it in this string <a href="something.com/u/testing"></a> which I am trying to ignore.
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      1. USCaleb Keith
    2. COWhat if there is a space after it or before it? I try to understand this stuff, I have gotten up to the URL part but I got lost.
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    3. COCan you check out my updated question? I updated the example. I don't want to parse html, I want to ignore it. If there is a quote after it, don't match. If there is a / after it, don't match it. How can I do that? It also needs to be multiline as well and if you try the exact copy/paste of what I posted, it doesn't work correctly. I'm sorry to give you problems with this.
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