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    <p>There is an alternative approach, which does not have I18n problems (allowing ',' or '.' but not both): <a href="http://msdn.microsoft.com/library/9zbda557" rel="noreferrer"><code>Decimal.TryParse</code></a>.</p> <p>Just try converting, ignoring the value.</p> <pre><code>bool IsDecimalFormat(string input) { Decimal dummy; return Decimal.TryParse(input, out dummy); } </code></pre> <p>This is significantly faster than using a regular expression, see below.</p> <p>(The overload of <a href="http://msdn.microsoft.com/library/ew0seb73" rel="noreferrer"><code>Decimal.TryParse</code></a> can be used for finer control.)</p> <hr/> <p>Performance test results: Decimal.TryParse: 0.10277ms, Regex: 0.49143ms</p> <p>Code (<code>PerformanceHelper.Run</code> is a helper than runs the delegate for passed iteration count and returns the average <code>TimeSpan</code>.):</p> <pre><code>using System; using System.Text.RegularExpressions; using DotNetUtils.Diagnostics; class Program { static private readonly string[] TestData = new string[] { "10.0", "10,0", "0.1", ".1", "Snafu", new string('x', 10000), new string('2', 10000), new string('0', 10000) }; static void Main(string[] args) { Action parser = () =&gt; { int n = TestData.Length; int count = 0; for (int i = 0; i &lt; n; ++i) { decimal dummy; count += Decimal.TryParse(TestData[i], out dummy) ? 1 : 0; } }; Regex decimalRegex = new Regex(@"^[0-9]([\.\,][0-9]{1,3})?$"); Action regex = () =&gt; { int n = TestData.Length; int count = 0; for (int i = 0; i &lt; n; ++i) { count += decimalRegex.IsMatch(TestData[i]) ? 1 : 0; } }; var paserTotal = 0.0; var regexTotal = 0.0; var runCount = 10; for (int run = 1; run &lt;= runCount; ++run) { var parserTime = PerformanceHelper.Run(10000, parser); var regexTime = PerformanceHelper.Run(10000, regex); Console.WriteLine("Run #{2}: Decimal.TryParse: {0}ms, Regex: {1}ms", parserTime.TotalMilliseconds, regexTime.TotalMilliseconds, run); paserTotal += parserTime.TotalMilliseconds; regexTotal += regexTime.TotalMilliseconds; } Console.WriteLine("Overall averages: Decimal.TryParse: {0}ms, Regex: {1}ms", paserTotal/runCount, regexTotal/runCount); } } </code></pre>
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    1. COThat’s not only faster, it’s much cleaner.
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