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copied!<p>if its just a matter of SPACE;</p> <p>try this Source : <a href="http://www.codeproject.com/Articles/10890/Fastest-C-Case-Insenstive-String-Replace" rel="nofollow">http://www.codeproject.com/Articles/10890/Fastest-C-Case-Insenstive-String-Replace</a></p> <pre><code> private static string ReplaceEx(string original, string pattern, string replacement) { int count, position0, position1; count = position0 = position1 = 0; string upperString = original.ToUpper(); string upperPattern = pattern.ToUpper(); int inc = (original.Length / pattern.Length) * (replacement.Length - pattern.Length); char[] chars = new char[original.Length + Math.Max(0, inc)]; while ((position1 = upperString.IndexOf(upperPattern, position0)) != -1) { for (int i = position0; i < position1; ++i) chars[count++] = original[i]; for (int i = 0; i < replacement.Length; ++i) chars[count++] = replacement[i]; position0 = position1 + pattern.Length; } if (position0 == 0) return original; for (int i = position0; i < original.Length; ++i) chars[count++] = original[i]; return new string(chars, 0, count); } </code></pre> <p>Usage:</p> <pre><code> string original_string = "Hello , how are you ?"; while (original_string.Contains(" ")) { original_string = ReplaceEx(original_string, " ", " "); } </code></pre> <p>Replacing the regex way:</p> <pre><code>string resultString = null; try { resultString = Regex.Replace(subjectString, @"\s+", " ", RegexOption.Compiled); } catch (ArgumentException ex) { // Syntax error in the regular expression } </code></pre>

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