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    <p>The regex approach is probably the quickest to implement but not the quickest to run. I compared a simple regex solution to the following manual search code and found that the manual search code is ~2x-2.5x faster for large input strings and up to 4x faster for small strings:</p> <pre><code>static string Search(string expression) { int run = 0; for (int i = 0; i &lt; expression.Length; i++) { char c = expression[i]; if (Char.IsDigit(c)) run++; else if (run == 5) return expression.Substring(i - run, run); else run = 0; } return null; } const string pattern = @"\d{5}"; static string NotCached(string expression) { return Regex.Match(expression, pattern, RegexOptions.Compiled).Value; } static Regex regex = new Regex(pattern, RegexOptions.Compiled); static string Cached(string expression) { return regex.Match(expression).Value; } </code></pre> <p>Results for a ~50-char string with a 5-digit string in the middle, over 10^6 iterations, latency per call in microseconds (smaller number is faster):</p> <p>Simple search: 0.648396us</p> <p>Cached Regex: 2.1414645us</p> <p>Non-cached Regex: 3.070116us</p> <p>Results for a ~40K string with a 5-digit string in the middle over 10^4 iterations, latency per call in microseconds (smaller number is faster):</p> <p>Simple search: 423.801us</p> <p>Cached Regex: 1155.3948us</p> <p>Non-cached Regex: 1220.625us</p> <p>A little surprising: I would have expected Regex -- which is compiled to IL -- to be comparable to the manual search, at least for very large strings.</p>
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