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2011-06-02T12:52:02.573
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2011-06-02T12:52:02.573
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A bit of manual parsing is probably the fastest way to solve this. Regex would be possible, too, because it's really just a very simple case of parsing a link and not a whole HTML document, but that could easily choke on those large files, performance wise. Now, let me preface this that I haven't tested this at all and I feel kinda dirty posting it (I'm sure it needs some more edge-case checks to avoid errors), but here you go: <pre><code> const char[] quotes = new char[] { '"', '\'' }; private List<string> ExtractLinks(string html) { var links = new List<string>(); string searchFor = ">Fixed_String</a>"; for (int i = html.IndexOf(searchFor); i >= 0; i = html.IndexOf(searchFor, i + searchFor.Length)) { string href = ExtractHref(html, i); if (!String.IsNullOrEmpty(href)) links.Add(href); } return links; } private string ExtractHref(string html, int backtrackFrom) { int hrefStart = -1; // Find "<a", but limit search so we don't backtrack forever for (int i = backtrackFrom; i > backtrackFrom - 255; i--) { if (i < 0) return null; if (html[i] == '<' && html[i + 1] == 'a') { hrefStart = html.IndexOf("href=", i); break; } } if (hrefStart < 0) return null; int start = html.IndexOfAny(quotes, hrefStart); if (start < 0) return null; int end = html.IndexOfAny(quotes, start + 1); if (end < 0) return null; return html.Substring(start + 1, end - start - 1); } </code></pre> <code>XmlReader</code> is probably a no-go, because you most likely cannot guarantee that those files are XHTML formatted. If you want to do proper parsing, the <a href="http://htmlagilitypack.codeplex.com/" rel="nofollow">HTML Agility Pack</a> is probably your best choice, or maybe a properly done Regex if it can't be helped. I posted this manual parsing so you have another alternative you can do a performance test with.
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1. POFastest way to extract a substring in C#
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