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    <p>Try this:</p> <pre><code>bool result = Regex.IsMatch(input, @".*(.+).*\1.*\1.*"); </code></pre> <p>Basically, it checks if a pattern of one or more characters appears 3 or more times in the same string. </p> <p><strong>Full explanation:</strong></p> <p>First, it matches 0 or more characters at the beginning of the string. Then it captures a group of one or more. Then it matches 0 or more, and then the group again. Then 0 or more <strong>again</strong>, and then the capture again. Then 0 or more again.</p> <p>If you require the string to be consecutive, try this:</p> <pre><code>bool result = Regex.IsMatch(input, @".*(.+)\1\1.*"); </code></pre> <p>Also, some performance test results:</p> <pre><code>Non-consecutive: 312ms Consecutive: 246ms </code></pre> <p>Tests were done with this program:</p> <pre><code>using System; using System.Diagnostics; using System.Text.RegularExpressions; class Program { public static void Main(string[] args) { string input = "brbrbr"; Regex one = new Regex(@".*(.+).*\1.*\1.*"); for (int i = 0; i &lt; 5; i++) { bool x = one.IsMatch(input); //warm regex up } Stopwatch sw = Stopwatch.StartNew(); for (int i = 0; i &lt; 100000; i++) { bool x = one.IsMatch(input); } sw.Stop(); Console.WriteLine("Non-consecutive: {0}ms", sw.ElapsedMilliseconds); Regex two = new Regex(@".*(.+)\1\1.*"); for (int i = 0; i &lt; 5; i++) { bool x = two.IsMatch(input); //warm regex up } Stopwatch sw2 = Stopwatch.StartNew(); for (int i = 0; i &lt; 100000; i++) { bool x = two.IsMatch(input); } sw.Stop(); Console.WriteLine("Consecutive: {0}ms", sw2.ElapsedMilliseconds); Console.ReadKey(true); } } </code></pre>
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    1. USIt'sNotALie.
    1. USIt'sNotALie.
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    1. COIs the regex simpler/faster if you require the triple match to be consecutive?
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      1. USPatashu
    2. CO@Patashu Not sure if faster, going to do some performance tests. Be back in a sec :). But definitely simpler, mainly cos you get rid of a lot of `.*`'s.
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      1. USIt'sNotALie.
    3. COThere is a consecutive requirement for the string. I think this would work '@".*(.+)\1\1.*"'. I'm unsure, though.
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      1. USStickman
 

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