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    <p>I think, the Reg-Ex expression to match all Key-Value-Pairse your are whant is:</p> <pre><code>&lt;Context&gt;\s*?&lt;Key&gt;(.*?)\&lt;/Key&gt;\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\s*?&lt;/Context&gt; </code></pre> <p>Description:</p> <pre><code>// &lt;Context&gt;\s*?&lt;Key&gt;(.*?)\&lt;/Key&gt;\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\s*?&lt;/Context&gt; // // Match the characters "&lt;Context&gt;" literally «&lt;Context&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;Key&gt;" literally «&lt;Key&gt;» // Match the regular expression below and capture its match into backreference number 1 «(.*?)» // Match any single character that is not a line break character «.*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the character "&lt;" literally «\&lt;» // Match the characters "/Key&gt;" literally «/Key&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;Value&gt;" literally «&lt;Value&gt;» // Match the regular expression below and capture its match into backreference number 2 «(.*?)» // Match any single character that is not a line break character «.*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;/Value&gt;" literally «&lt;/Value&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;/Context&gt;" literally «&lt;/Context&gt;» </code></pre> <p>Usage:</p> <pre><code>using System.Text.RegularExpressions; public static void RunSnippet() { Regex RegexObj = new Regex("&lt;Context&gt;\\s*?&lt;Key&gt;(.*?)\\&lt;/Key&gt;\\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\\s*?&lt;/Context&gt;", RegexOptions.IgnoreCase | RegexOptions.Multiline); Match MatchResults = RegexObj.Match(@"&lt;ContextDetails&gt; &lt;Context&gt;&lt;Key&gt;ID&lt;/Key&gt;&lt;Value&gt;100&lt;/Value&gt;&lt;/Context&gt; &lt;Context&gt;&lt;Key&gt;Name&lt;/Key&gt; &lt;Value&gt;MyName&lt;/Value&gt;&lt;/Context&gt; &lt;/ContextDetails&gt; "); while (MatchResults.Success){ Console.WriteLine("Key: " + MatchResults.Groups[1].Value) ; Console.WriteLine("Value: " + MatchResults.Groups[2].Value) ; Console.WriteLine("----"); MatchResults = MatchResults.NextMatch(); } } /* Output: Key: ID Value: 100 ---- Key: Name Value: MyName ---- */ </code></pre> <p>The Regular-Expression to math only the Value or the Key "Name":</p> <pre><code>&lt;Context&gt;\s*?&lt;Key&gt;Name&lt;/Key&gt;\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\s*?&lt;/Context&gt; </code></pre> <p>Description:</p> <pre><code>// &lt;Context&gt;\s*?&lt;Key&gt;Name&lt;/Key&gt;\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\s*?&lt;/Context&gt; // // Match the characters "&lt;Context&gt;" literally «&lt;Context&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;Key&gt;Name&lt;/Key&gt;" literally «&lt;Key&gt;Name&lt;/Key&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;Value&gt;" literally «&lt;Value&gt;» // Match the regular expression below and capture its match into backreference number 1 «(.*?)» // Match any single character that is not a line break character «.*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;/Value&gt;" literally «&lt;/Value&gt;» // Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.) «\s*?» // Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?» // Match the characters "&lt;/Context&gt;" literally «&lt;/Context&gt;» </code></pre> <p>Usage:</p> <pre><code>string SubjectString = @"&lt;ContextDetails&gt; &lt;Context&gt;&lt;Key&gt;ID&lt;/Key&gt;&lt;Value&gt;100&lt;/Value&gt;&lt;/Context&gt; &lt;Context&gt;&lt;Key&gt;Name&lt;/Key&gt; &lt;Value&gt;MyName&lt;/Value&gt;&lt;/Context&gt; &lt;/ContextDetails&gt; "; Console.WriteLine( Regex.Match(SubjectString, "&lt;Context&gt;\\s*?&lt;Key&gt;Name&lt;/Key&gt;\\s*?&lt;Value&gt;(.*?)&lt;/Value&gt;\\s*?&lt;/Context&gt;", RegexOptions.IgnoreCase | RegexOptions.Multiline).Groups[1].Value ); </code></pre>
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    1. POregex to match <Key>....<Value> pattern
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    1. COWow, that's an explanation! =) May I ask if you used some generator to do this for you? That would come in quite handy!
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    2. CORegExBuddy is the generator for the explanation. Its an RegEx-Editor with Debugger an mutch more. (URL: http://www.regexbuddy.com/)
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