Speed test for email text replacements, C#

Language: Layout:

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Diagnostics;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;

namespace Rextester
{
    public static class StringExtension {

//private static Dictionary<string, string> _replacements = new Dictionary<string, string>();

static StringExtension() {
            
        }

public static string clean(this string s, Dictionary<string, string> replacements) {
            foreach (string to_replace in replacements.Keys) {
                s = s.Replace(to_replace, replacements[to_replace]);
            }
            return s;
        }
        
        public static string StringBuilderclean(string data, Dictionary<string, string> values)
        {
            StringBuilder sb = new StringBuilder(data, data.Length * 2);
            foreach (string k in values.Keys)
            {
                sb.Replace(k, values[k]);
            }
            return sb.ToString();
        }

public static string Regexclean(string input, Dictionary<string, string> replacements)
        {
            
            var regex = new Regex(String.Join("|",replacements.Keys.Select(k => Regex.Escape(k))));
            var replaced = regex.Replace(input,m => replacements[m.Value]);
            return replaced;
        }
    }
        
    public class Program
    {
        
        
        public static void Main(string[] args)
        {
            var input = @"<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>\
<html xmlns='http://www.w3.org/1999/xhtml' xmlns:v='urn:schemas-microsoft-com:vml' xmlns:o='urn:schemas-microsoft-com:office:office'>\
<head>\
    <title></title>\
    <meta http-equiv='Content-Type' content='text/html; charset=utf-8' />\
    <style type='text/css'>\
        body, .maintable {\
            height: 100% !important;\
            width: 100% !important;\
            margin: 0;\
            padding: 0;\
            font-family: arial, helvetica, sans-serif;\
        }\
\
        a {\
            color: #555555;\
            text-decoration: none;\
        }\
\
            a.black {\
                color: #555555;\
            }\
\
            a.white {\
                color: #ffffff;\
            }\
\
            img, a img {\
                border: 0;\
                outline: none;\
                text-decoration: none;\
            }\
\
        .imagefix {\
            display: block;\
        }\
\
        p {\
            margin-top: 0;\
            margin-right: 0;\
            margin-left: 0;\
            padding: 0;\
        }\
\
        .ReadMsgBody {\
            width: 100%;\
        }\
\
        .ExternalClass {\
            width: 100%;\
        }\
\
            .ExternalClass, .ExternalClass p, .ExternalClass span, .ExternalClass font, .ExternalClass td, .ExternalClass div {\
                line-height: 100%;\
            }\
\
        img {\
            -ms-interpolation-mode: bicubic;\
        }\
\
        body, table, td, p, a, li, blockquote {\
            -ms-text-size-adjust: 100%;\
            -webkit-text-size-adjust: 100%;\
        }\
    </style>\
    <style type='text/css'>\
        @media only screen and (max-width: 600px) {\
            .rtable {\
                width: 100% !important;\
                table-layout: fixed;\
            }\
\
            .rtable tr {\
                height: auto !important;\
                display: block;\
            }\
\
            .contenttd {\
                max-width: 100% !important;\
                display: block;\
            }\
\
            .contenttd:after {\
                content: '';\
                display: table;\
                clear: both;\
            }\
\
            .hiddentds {\
                display: none;\
            }\
\
            .imgtable, .imgtable table {\
                max-width: 100% !important;\
                height: auto;\
                float: none;\
                margin: 0 auto;\
            }\
\
            .imgtable.btnset td {\
                display: inline-block;\
            }\
\
            .imgtable img {\
                /*width: 100%;*/\
                height: auto;\
                display: block;\
            }\
\
            table {\
                float: none;\
                table-layout: fixed;\
            }\
        }\
    </style>\
    \
</head>\
<body style='overflow: auto; padding:0; margin:0; font-size: 14px; font-family: arial, helvetica, sans-serif; cursor:auto; background-color:#F0F0F0'>\
<table style='overflow: auto; padding: 0; margin: 0; font-size: 14px; font-family: arial, helvetica, sans-serif; cursor: auto; background-color: #f0f0f0;' width='100%' cellspacing='0' cellpadding='0' bgcolor='#F0F0F0'>\
<tbody>\
<tr>\
<td style='font-size: 0px; height: 20px; line-height: 0;'> </td>\
</tr>\
<tr>\
<td valign='top'>\
<table class='rtable' style='width: 600px; margin: 0px auto; background-color: #ffffff;' border='0' width='600' cellspacing='0' cellpadding='0' align='center'>\
<tbody>\
<tr>\
<td style='background-color: #ffffff; padding: 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='left'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 75%; line-height: 0;'> </td>\
<td style='font-size: 0px; height: 0px; width: 25%; line-height: 0;'> </td>\
</tr>\
<tr style='height: 10px; width: 100%;'>\
<th style='font-weight: normal; text-align: left; background-color: #ffffff; color: #555555; padding: 5px 15px 5px 10px; width: 75%; vertical-align: middle;'>\
<table style='margin-left: 0px; margin-right: auto;' border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='padding: 2px 2px 2px 2px;' align='center'>\
<table border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='background-color: transparent;'><a href='https://www.sworder.co.uk'> <img style='display: block;' src='https://www.sworder.co.uk/imagestore/Email%20Templates/sworders-logo-strap-black-300.png?v=636379594834000000' alt='' width='135' height='55' hspace='0' vspace='0' /> </a></td>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
</tbody>\
</table>\
</th>\
<th style='font-weight: normal; text-align: left; background-color: #ffffff; color: #555555; padding: 5px 0px 5px 15px; vertical-align: middle;'>\
<table style='margin-left: 0px; margin-right: auto;' border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='padding: 2px 2px 2px 2px;' align='center'>\
<table border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='background-color: transparent; color: #555555;' align='center'><a href='https://www.sworder.co.uk/account'><img style='display: block;' src='https://www.sworder.co.uk/imagestore/Email%20Templates/account.png?v=636362367452630000' alt='' width='28' height='19' hspace='0' vspace='0' /></a>\
<p style='padding-top: 10px;'><a class='black' href='https://www.sworder.co.uk/account'>MY ACCOUNT</a></p>\
</td>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
</tbody>\
</table>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td class='contenttd' style='background-color: #7da6b5; padding: 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='center'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 100%; line-height: 0; mso-line-height-rule: exactly;'> </td>\
</tr>\
<tr style='height: 20px;'>\
<th class='contenttd' style='vertical-align: top; font-weight: normal; text-align: left; background-color: transparent; padding: 20px 15px 20px 15px;'>\
<p style='font-size: 24px; line-height: 24px; margin-bottom: 0; font-family: geneve, arial, helvetica, sans-serif; margin-top: 0px; color: #ffffff; background-color: transparent; mso-line-height-rule: exactly;' align='center'>INVOICE PAID</p>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td class='contenttd' style='background-color: #ffffff; padding: 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='center'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 100%; line-height: 0; mso-line-height-rule: exactly;'> </td>\
</tr>\
<tr style='height: 20px;'>\
<th class='contenttd' style='vertical-align: top; font-weight: normal; text-align: left; background-color: #ffffff; padding: 20px 15px 20px 15px;'>\
<p style='font-size: 14px; line-height: 18px; margin-bottom: 0; font-family: geneve, arial, helvetica, sans-serif; margin-top: 0px; color: #000000; background-color: transparent; mso-line-height-rule: exactly;' align='left'>Dear client, <br /><br />Thank you for the payment of your invoice.  The details of the transaction are shown below.</p>\
<h2>INVOICE PAYMENT DETAILS</h2>\
<table width='100%'>\
<tbody>\
<tr>\
<td><strong>Payment from:</strong><br />[address]</td>\
<td><strong>Invoice number:</strong><br />[invoice-number]<br /><strong>Invoice paid date:</strong><br />[invoice-paid-date]</td>\
<td rowspan='2' align='center'><a href='[invoice-pdf-url]'><img src='https://www.sworder.co.uk/imagestore/Email%20Templates/pdf-icon-transparent.png?v=636391835812230000' width='141' height='166' /></a><br /><a href='[invoice-pdf-url]'>Click here</a> to download <br />a PDF of your invoice</td>\
</tr>\
<tr>\
<td><strong>Invoice total (inc VAT):</strong> <br /><strong>Surcharge fee:</strong><br /><strong>Invoice total paid:</strong> </td>\
<td align='right'><strong><br /></strong>£[invoice-amount]<br />£[invoice-surcharge]<br />£[invoice-total]<strong><br /></strong></td>\
</tr>\
<tr>\
<td colspan='3'><strong><br />Authorisation code:</strong> [payment-authcode]<br /><strong>Reference code:</strong> [payment-identifier]</td>\
</tr>\
</tbody>\
</table>\
<p style='font-size: 14px; line-height: 18px; margin-bottom: 0; font-family: geneve, arial, helvetica, sans-serif; margin-top: 0px; color: #000000; background-color: transparent; mso-line-height-rule: exactly;' align='left'><br /><strong>Packing and postage<br /></strong><br />Sworders are happy to guide you through package and postage needs. <br /><br />Sworders</p>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td class='contenttd' style='background-color: #7da6b5; color: #ffffff; padding: 0px 0px 5px 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='left'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 75%; line-height: 0;'> </td>\
<td style='font-size: 0px; height: 0px; width: 25%; line-height: 0;'> </td>\
</tr>\
<tr style='height: 10px;'>\
<th class='contenttd' style='vertical-align: top; font-weight: normal; text-align: left; background-color: transparent; padding: 5px;'>\
<div style='text-align: left; padding: 10px;'>\
<table class='imgtable imgTable' style='display: inline-block;' border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='padding-right: 5px;'><a href='https://www.sworder.co.uk'> <img style='display: block;' src='https://www.sworder.co.uk/imagestore/Email%20Templates/sworders-logo-strap-white-300.png?v=636379096306570000' alt='' width='162' height='55' hspace='0' vspace='0' /> </a></td>\
</tr>\
</tbody>\
</table>\
</div>\
</th>\
<th class='contenttd' style='vertical-align: top; font-weight: normal; text-align: left; background-color: transparent; padding: 5px;'>\
<div style='text-align: right; padding: 10px;'>\
<table class='imgtable imgTable' style='display: inline-block;' border='0' cellspacing='0' cellpadding='0'>\
<tbody>\
<tr>\
<td style='color: #ffffff; padding-right: 5px; text-align: right;' colspan='4'>\
<p class='font-size: 14px; line-height: 18px;'>Connect with us</p>\
</td>\
</tr>\
<tr>\
<td style='padding-right: 10px;'><a href='https://www.facebook.com/swordersfineart/' target='_blank' rel='noopener noreferrer'><img style='display: block;' title='Facebook' src='https://www.sworder.co.uk/imagestore/Email%20Templates/facebook-icon.png?v=636378900234600000' alt='Facebook' width='26' height='26' /></a></td>\
<td style='padding-right: 10px;'><a href='https://twitter.com/swordersfineart' target='_blank' rel='noopener noreferrer'><img style='display: block;' title='Twitter' src='https://www.sworder.co.uk/imagestore/Email%20Templates/twitter-icon.png?v=636378900234630000' alt='Twitter' width='26' height='26' /></a></td>\
<td style='padding-right: 10px;'><a href='https://uk.pinterest.com/swordersfineart/' target='_blank' rel='noopener noreferrer'><img style='display: block;' title='Pinterest' src='https://www.sworder.co.uk/imagestore/Email%20Templates/pinterest-icon.png?v=636378900234630000' alt='Pinterest' width='26' height='26' /></a></td>\
<td><a href='https://www.instagram.com/swordersfineart/' target='_blank' rel='noopener noreferrer'><img style='display: block;' title='Linkedin' src='https://www.sworder.co.uk/imagestore/Email%20Templates/instagram.png?v=636378900234600000' alt='Instagram' width='26' height='26' /></a></td>\
</tr>\
</tbody>\
</table>\
</div>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td class='contenttd' style='background-color: #7da6b5; color: #ffffff; padding: 1px 0px 1px 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='left'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 600px; line-height: 0; mso-line-height-rule: exactly;'> </td>\
</tr>\
<tr style='height: 10px;'>\
<th class='contenttd' style='font-weight: normal; text-align: left; background-color: transparent; color: #ffffff; padding: 1px 15px; vertical-align: top;'>\
<p style='font-size: 12px; margin-bottom: 1em; font-family: arial, helvetica, sans-serif; margin-top: 0px; line-height: 12px; background-color: transparent; mso-line-height-rule: exactly;' align='center'><a class='white' href='https://www.sworder.co.uk/contact-stansted'>Stansted Saleroom</a> - telephone 01279 817778 <br /> <a class='white' href='mailto:auctions@sworder.co.uk'>auctions@sworder.co.uk</a> <br /><br /> <a class='white' href='https://www.sworder.co.uk/contact-hertford'>Hertford Office</a> - telephone 01992 583 508 <br /> <a class='white' href='mailto:hertfordoffice@sworder.co.uk'>hertfordoffice@sworder.co.uk</a> <br /><br />Sworders Kent - telephone 01732 757 675 <br /> <a class='white' href='mailto:kent@sworder.co.uk'>kent@sworder.co.uk</a></p>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td class='contenttd' style='background-color: #ececec; color: #555555; padding: 10px 0px 10px 0px;'>\
<table style='width: 100%;' cellspacing='0' cellpadding='0' align='left'>\
<tbody>\
<tr class='hiddentds'>\
<td style='font-size: 0px; height: 0px; width: 600px; line-height: 0; mso-line-height-rule: exactly;'> </td>\
</tr>\
<tr style='height: 10px;'>\
<th class='contenttd' style='font-weight: normal; text-align: left; background-color: transparent; color: #555555; padding: 1px 15px; vertical-align: top;'>\
<p style='font-size: 12px; margin-bottom: 1em; font-family: arial, helvetica, sans-serif; margin-top: 0px; line-height: 12px; background-color: transparent; mso-line-height-rule: exactly;' align='left'>We are sending this email to <a class='black' href='mailto:[email]'>[email]</a>. <br /><br /> You are receiving this email because you have signed up to receive sale notice emails when registering with <a class='black' href='https://www.sworder.co.uk'>www.sworder.co.uk</a>. <br /><br /> Please see our buying conditions <a class='black' href='https://www.sworder.co.uk/terms-and-conditions'>here</a>.</p>\
</th>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
</tbody>\
</table>\
</td>\
</tr>\
<tr>\
<td style='font-size: 0px; height: 8px; line-height: 0;'> </td>\
</tr>\
</tbody>\
</table>\
</body>\
</html>\";
            int count;
            int repeat = 1000;
            Console.WriteLine("Repeats: " + repeat);
            
            string output1="1";
            Dictionary<string, string> replacements = new Dictionary<string, string>();

replacements["[full-name]"] = "My [full-name] Here";
            replacements["[first-name]"] = "My [first-name] Here";
            replacements["[email]"] = "My [email] Here";
            replacements["[address]"] = "My [address] Here";
            replacements["[auction-name]"] = "My [auction-name] Here";
            replacements["[auction-number]"] = "My [auction-number] Here";
            replacements["[auction-date]"] = "My [auction-date] Here";
            replacements["[payment-identifier]"] = "My [payment-identifier] Here";
            replacements["[payment-authcode]"] = "My [payment-authcode] Here";
            replacements["[invoice-number]"] = "My [invoice-number] Here";
            replacements["[invoice-amount]"] = "My [invoice-amount] Here";
            replacements["[invoice-surcharge]"] = "My [invoice-surcharge] Here";
            replacements["[invoice-total]"] = "My [invoice-total] Here";
            replacements["[invoice-paid-date]"] = "My [invoice-paid-date] Here";
            replacements["[invoice-pdf-url]"] = "My [invoice-pdf-url] Here";
            // etc...
        
           string output4 = "4";
            Stopwatch watch4 = Stopwatch.StartNew();
            for (count=repeat;count >=0;count--)
                output4 = Rextester.StringExtension.Regexclean(input, replacements);
            //Console.WriteLine( Rextester.StringExtension.Regexclean(input, replacements));
            watch4.Stop();
            double stringMilliseconds4 = watch4.ElapsedMilliseconds;
            Console.WriteLine("Regex replace  with dictionary: " + stringMilliseconds4);
  
            Stopwatch watch1 = Stopwatch.StartNew();
            for (count=repeat;count >=0;count--)
                output1 = Rextester.StringExtension.clean(input, replacements);
            //Console.WriteLine( Rextester.StringExtension.clean(input, replacements));
            watch1.Stop();
            double stringMilliseconds = watch1.ElapsedMilliseconds;
            Console.WriteLine("String replace with dictionary: " + stringMilliseconds);

string output2="2";
            Stopwatch watch2 = Stopwatch.StartNew();
            for (count=repeat;count >=0;count--)
                output2 = input.Replace("[full-name]", "My [full-name] Here")
                                    .Replace("[first-name]", "My [first-name] Here")
                                    .Replace("[email]", "My [email] Here")
                                    .Replace("[address]", "My [address] Here")
                                    .Replace("[auction-name]", "My [auction-name] Here")
                                    .Replace("[auction-number]", "My [auction-number] Here")
                                    .Replace("[auction-date]", "My [auction-date] Here")
                                    .Replace("[payment-identifier]", "My [payment-identifier] Here")
                                    .Replace("[payment-authcode]", "My [payment-authcode] Here")
                                    .Replace("[invoice-number]", "My [invoice-number] Here")
                                    .Replace("[invoice-amount]", "My [invoice-amount] Here")
                                    .Replace("[invoice-surcharge]", "My [invoice-surcharge] Here")
                                    .Replace("[invoice-total]", "My [invoice-total] Here")
                                    .Replace("[invoice-paid-date]", "My [invoice-paid-date] Here")
                                    .Replace("[invoice-pdf-url]", "My [invoice-pdf-url] Here");
                
            watch2.Stop();
            double stringMilliseconds2 = watch2.ElapsedMilliseconds;
            Console.WriteLine("String replace with inline code:" + stringMilliseconds2);
           
            
            string output3="3";
            Stopwatch watch3 = Stopwatch.StartNew();
            for (count=repeat;count >=0;count--)
                output3 = Rextester.StringExtension.StringBuilderclean(input, replacements);
            watch3.Stop();
            double stringMilliseconds3 = watch3.ElapsedMilliseconds;
            Console.WriteLine("Stringbuilder  with dictionary: " + stringMilliseconds3);

Console.WriteLine(output1 == output2 ? "1 and 2 match" : "1 and 2 don't match");
                Console.WriteLine(output2 == output3 ? "2 and 3 match" : "2 and 3 don't match");
                Console.WriteLine(output3 == output4 ? "3 and 4 match" : "3 and 4 don't match");
                Console.WriteLine(output1 == output3 ? "1 and 3 match" : "1 and 3 don't match");
                Console.WriteLine(output1 == output4 ? "1 and 4 match" : "1 and 4 don't match");
            
        }
    }
                }

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 4,5 sec, cpu time: 4,5 sec, average memory usage: 34 Mb, average nr of threads: 5