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    <p><code>TestOne</code> will be faster than <code>TestTwo</code>, because you're not creating a new regular expression for every loop iteration.</p> <p>This has two benefits:</p> <ul> <li>The time used to parse and construct the objects for the regex is only done once, instead of <code>mc.Count</code> times</li> <li>Less pressure on garbage collection since fewer objects are constructed.</li> </ul> <p>However, I would go one step further. If you're always going to return that same regular expression, and you're concerned about speed, I would cache that regex object in a static field.</p> <p>For instance, you might consider this:</p> <pre><code>private static Regex _FindNumber; public static Regex FindNumber() { if (_FindNumber == null) _FindNumber = new Regex(@"\d+", RegexOptions.IgnoreCase | RegexOptions.Compiled); return _FindNumber; } </code></pre> <p>This would create just one object, total, and keep it around.</p> <p>However, and here's my real answer.</p> <p>To actually know which one is going to be the fastest, you're going to have to measure your code, optionally with my variant thrown in for good measure, and then decide. Never decide on optimizations without hard data, you might end up spending time rewriting code, which can introduce new bugs, which will need fixing, which you will spend more time on, only to eek out another 1% of performance.</p> <p>The big optimizations are done algorithmically, like changing the type of sorting algorithm, and then only afterwards, if necessary, you move on to local optimizations like loop tuning.</p> <p>Having said that, I would at least avoid constructing the object in the loop, that's just common sense.</p>
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    1. COI am going to repeat this comment as stated on womps answer, because it still applies. The code I am using has an extremely large class. Its a text parser for a text based strategy game. I am trying to refactor it a bit and thats what I am wondering here. If I do create a private variable for the Regex, wouldn't it be run every time the class is accessed? Thats my question to you.
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    2. COScott: The code provided above creates the Regex stored in _FindNumber the first time the FindNumber static property is accessed and it will continue to exist until the program ends.
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    3. COEvery time you call the method that returns a new Regex object, you'll get a new Regex object, which will take time to construct, and add GC pressure. If you cache that object so that the next time you call that same function, it just fetches the previously generated object, you'll save time, and GC pressure. If you call the function, and it doesn't cache, in a loop, each loop iteration will take more time since it constructs more objects, and add more GC pressure. Does that answer your question? If not, be specific.
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