Case-Insensitive String Replace

int ReplaceNoCase(CString& str, LPCTSTR pszOld, LPCTSTR pszNew)
{
	CString	sDest(str);
	CString	sOld(pszOld);
	sDest.MakeLower();	// convert destination and old string to lower case
	sOld.MakeLower();
	// first pass: find instances of old string and store their positions
	int	nOldLen = sOld.GetLength();
	CDWordArray	arrSub;
	int	iPos = 0;
	while ((iPos = sDest.Find(sOld, iPos)) >= 0) {	// while old string is found
		arrSub.Add(iPos);	// add found string's position to substitution array
		iPos += nOldLen;	// advance position past found string
	}
	// second pass: do the substitions, in reverse order for stability
	int	nSubs = static_cast<int>(arrSub.GetSize());	// string indices are 32-bit
	for (int iSub = nSubs - 1; iSub >= 0; iSub--) {	// for each substitution
		str.Delete(arrSub[iSub], nOldLen);	// delete old string
		str.Insert(arrSub[iSub], pszNew);	// insert new string
	}
	return nSubs;	// return number of substitutions
}

void newReplace2(CString& mainStr, CString& oldStr, CString& newStr)<br />
{<br />
        //Prevent infinite loop when user tries to replace nothing.<br />
	if (oldStr != "")<br />
	{<br />
		int oldLen = oldStr.GetLength(), newLen = newStr.GetLength();<br />
		int nPos = 0, lastPos = 0, newPos = 0, posDiff = 0;<br />
<br />
                //Copies of the main string and the string to be replaced that<br />
                //are made lower case<br />
		CString mainStr_low(mainStr);<br />
		CString oldStr_low(oldStr);<br />
		mainStr_low.MakeLower();<br />
		oldStr_low.MakeLower();<br />
<br />
		while ((nPos = mainStr_low.Find(oldStr_low, nPos)) != -1)<br />
		{<br />
                        //Calc number of characters between last match and<br />
                        //new match<br />
			posDiff = nPos - lastPos;<br />
			<br />
                        //Determine the position of the match in the string<br />
                        //to be returned<br />
			newPos += posDiff;<br />
<br />
                        //Do the replace in the main string that will be<br />
                        //returned.<br />
			mainStr.Delete(newPos, oldLen);<br />
			mainStr.Insert(newPos, newStr);<br />
<br />
                        //Skip the rest of the old string<br />
			nPos += oldLen;<br />
                        //Skip the new position to the end of the new string<br />
                        //To keep it inline with the position in the old<br />
                        //string<br />
			newPos += newLen;<br />
                        //Needed to determine posDiff above<br />
			lastPos = nPos;<br />
		}<br />
	}<br />
}