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POFastest way to remove chars from string
 

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    <p>I have a string from which I have to remove following char: '\r', '\n', and '\t'. I have tried three different ways of removing these char and benchmarked them so I can get the fastest solution.</p> <p>Following are the methods and there execution time when I ran them 1000000 times:</p> <p>It should be fastest solution if I have 1 or 2 char to remove. But as I put in more char, it starts to take more time</p> <pre><code>str = str.Replace("\r", string.Empty).Replace("\n", string.Empty).Replace("\t", string.Empty); </code></pre> <p><strong>Execution time = 1695</strong></p> <p>For 1 or 2 char, this was slower then String.Replace, but for 3 char it showed better performance.</p> <pre><code>string[] split = str.Split(new char[] { '\t', '\r', '\n' }, StringSplitOptions.None); str = split.Aggregate&lt;string&gt;((str1, str2) =&gt; str1 + str2); </code></pre> <p><strong>Execution time = 1030</strong></p> <p>The slowest of all, even with 1 char. Maybe my regular expression is not the best.</p> <pre><code>str = Regex.Replace(str, "[\r\n\t]", string.Empty, RegexOptions.Compiled); </code></pre> <p><strong>Execution time = 3500</strong></p> <p>These are the three solutions I came up with. Is there any better and faster solution that anyone here know, or any improvements I can do in this code?</p> <p><strong>String</strong> that I used for benchmarking:</p> <pre><code>StringBuilder builder = new StringBuilder(); builder.AppendFormat("{0}\r\n{1}\t\t\t\r\n{2}\t\r\n{3}\r\n{4}\t\t\r\n{5}\r\n{6}\r\n{7}\r\n{8}\r\n{9}", "SELECT ", "[Extent1].[CustomerID] AS [CustomerID], ", "[Extent1].[NameStyle] AS [NameStyle], ", "[Extent1].[Title] AS [Title], ", "[Extent1].[FirstName] AS [FirstName], ", "[Extent1].[MiddleName] AS [MiddleName], ", "[Extent1].[LastName] AS [LastName], ", "[Extent1].[Suffix] AS [Suffix], ", "[Extent1].[CompanyName] AS [CompanyName], ", "[Extent1].[SalesPerson] AS [SalesPerson], "); string str = builder.ToString(); </code></pre>
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