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    <p>You could loop through the String as an array of characters and use the <a href="http://msdn.microsoft.com/en-us/library/system.char.isupper%28v=vs.71%29.aspx" rel="nofollow">Char.IsUpper(char parameter)</a></p> <ol> <li>Instantiate a blank string</li> <li>Set up a loop to loop through the characters</li> <li>Check if you need to change the character to a different one <ol> <li>Yes: Check whether or not the character is upper or lower case, depending on the result, put the appropriate letter in the new string.</li> <li>No: Just throw that character into the new string</li> </ol></li> <li>Set the original string to the new string.</li> </ol> <p>Might not be the most efficient or spectacular way of doing things, but it is simple, and it works.</p> <p>On a side note: I am not sure how you are converting the characters, but if you are say, shifting the characters down the alphabet (when you DO want to convert them) by a constant amount, let's say you're shifting by 3. So a -> d and E -> G or something like that, then you could get the ASCII value from the character, add 3 (if you want to convert it) and then get the character from the ASCII value. As described <a href="http://forums.devx.com/showpost.php?s=57bc9183228905df688a7b4a8037589c&amp;p=64365&amp;postcount=4" rel="nofollow">here</a>. You would have to do checks though to make sure that you loop back from the end of the alphabet. (or the beginning, if you're shifting left).</p> <p>Edit #1: (Going to keep the above there)</p> <p>Really big block of code... Sorry! This was the best way I could see to do what you were asking. Hopefully someone might come up with a more elegant way. Please do comment or anything if you require clarification!</p> <pre><code> // (to be clear) This is Elias' (original) code modified. static void Main(string[] args) { string input = "As he DIDN'T ACHIEVE Success, he was fired"; Dictionary&lt;string, string&gt; map = new Dictionary&lt;string, string&gt;(); map.Add("didn't achieve success", "failed miserably"); string temp = input; foreach (var entry in map) { string key = entry.Key; string value = entry.Value; temp = Regex.Replace(temp, key, match =&gt; { string[] matchSplit = match.Value.Split(' '); string[] valueSplit = value.Split(' '); // Set the number of words to the lower one. // If they're the same, it doesn't matter. int numWords = (matchSplit.Length &lt;= valueSplit.Length) ? matchSplit.Length : valueSplit.Length; // only first letter of first word capitalized // only first letter of every word capitalized // all letters capitalized char[] result = value.ToCharArray(); ; for (int i = 0; i &lt; numWords; i++) { if (char.IsUpper(matchSplit[i][0])) { bool allIsUpper = true; int c = 1; while (allIsUpper &amp;&amp; c &lt; matchSplit[i].Length) { if (!char.IsUpper(matchSplit[i][c]) &amp;&amp; char.IsLetter(matchSplit[i][c])) { allIsUpper = false; } c++; } // if all the letters of the current word are true, allIsUpper will be true. int arrayPosition = ArrayPosition(i, valueSplit); Console.WriteLine(arrayPosition); if (allIsUpper) { for (int j = 0; j &lt; valueSplit[i].Length; j++) { result[j + arrayPosition] = char.ToUpper(result[j + arrayPosition]); } } else { // The first letter. result[arrayPosition] = char.ToUpper(result[arrayPosition]); } } } return new string(result); }, RegexOptions.IgnoreCase); } Console.WriteLine(temp); } public static int ArrayPosition(int i, string[] valueSplit) { if (i &gt; 0) { return valueSplit[i-1].Length + 1 + ArrayPosition(i - 1, valueSplit); } else { return 0; } return 0; } </code></pre>
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    1. COsee the example - ab df becomes de while abc becomes cde - obviously it's not about character convertion but rather sub setence replacement - as i stated in question
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    2. CO@537mb Ah, sorry about this. Focused too much on the abc -> cde. I'll be editing my answer (might take a bit).
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    3. CO@537mfb Actually, looking at Elias' answer, that's pretty much what I would do. I'll put a comment in Elias' answer.
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