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    <p>I don't know if it's too late, but I have an answer for you.</p> <p>The Rx extension method you need to use is <code>BufferWithCount</code>.</p> <p>I'll assume you know how to turn key press events into an <code>IObservable&lt;char&gt;</code>.</p> <p>So given you have a list of character sequences that you want to detect and then perform an action I suggest using a <code>Dictionary&lt;string, Action&gt;</code> to hold this data, like so:</p> <pre><code>var matches = new Dictionary&lt;string, Action&gt;() { { "ba", () =&gt; Console.WriteLine("ba") }, { "aba", () =&gt; Console.WriteLine("aba") }, { "baa", () =&gt; Console.WriteLine("baa") }, { "abc\t", () =&gt; Console.WriteLine("abc\\t") }, }; </code></pre> <p>So here's the Rx (and <code>IEnumerable</code>) queries required:</p> <pre><code>int max = matches .Select(m =&gt; m.Key.Length) .Max(); IObservable&lt;string&gt; chords = Enumerable .Range(2, max - 1) .Select(n =&gt; keys .BufferWithCount(n, 1) .Select(cs =&gt; new string(cs.ToArray()))) .Merge(); IObservable&lt;Action&gt; actions = chords .Where(s =&gt; matches.ContainsKey(s)) .Select(s =&gt; matches[s]); </code></pre> <p>So finally you just have an <code>IObservable&lt;Action&gt;</code> that you can subscribe to and you just invoke the <code>Action</code>.</p> <p>If you want to test out that this works use the following code:</p> <pre><code>IConnectableObservable&lt;char&gt; keys = "ababc\tdabaababc\tebad" .ToObservable() .Publish(); //`.Publish()` makes a cold observable become hot, // but you must call `Connect()` to start producing values. //insert above `matches` definition here. //insert above queries here. actions.Subscribe(a =&gt; a()); keys.Connect(); </code></pre> <p>The result should be:</p> <pre><code>ba aba abc\t ba aba baa ba aba abc\t ba </code></pre> <p>Enjoy!</p>
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