nosiema, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string text = "SOME SIDE TEXT WITH *BARCODE AND SIDE CONTAINS *SIDE BOTH BARCODE";
            Console.WriteLine("Original text".PadRight(20) + " : " + text);
            RegexReplace(text);
            StringReplace(text);
        }
        
        static void RegexReplace(string text)
        {
            const string PATTERN = @"(?<!\*){0}";
            string[] words = new string[] { "SIDE", "BARCODE" };

foreach(string word in words)
            {
                Regex r = new Regex(string.Format(PATTERN, word));
                text = r.Replace(text, "*" + word);
            }   
            Console.WriteLine("Regex replace".PadRight(20) + " : "  + text);
        }
        
        static void StringReplace(string text)
        {
            string[] words = new string[] { "SIDE", "BARCODE" };
            foreach(string word in words)
            {
                text = text.Replace(word, "*" + word);
            }   
            Console.WriteLine("String replace".PadRight(20) + " : "  + text);
        }
    }
}

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Compilation time: 0,12 sec, absolute running time: 0,16 sec, cpu time: 0,16 sec, average memory usage: 17 Mb, average nr of threads: 4