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Case-Insensitive String Replace

, 25 Jan 2000 CPOL
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Function to replace all occurences of a string within another, ignoring the case


This is a simple function that acts like CString::Replace(), except that the case of the string to search for is ignored.

The whole code follows:

// instr:  string to search in.
// oldstr: string to search for, ignoring the case.
// newstr: string replacing the occurrences of oldstr.
CString ReplaceNoCase( LPCTSTR instr, LPCTSTR oldstr, LPCTSTR newstr )
	CString output( instr );

	// lowercase-versions to search in.
	CString input_lower( instr );
	CString oldone_lower( oldstr );

	// search in the lowercase versions,
	// replace in the original-case version.
	int pos=0;
	while ( (pos=input_lower.Find(oldone_lower,pos))!=-1 ) {

		// need for empty "newstr" cases.
		input_lower.Delete( pos, lstrlen(oldstr) );	
		input_lower.Insert( pos, newstr );

		// actually replace.
		output.Delete( pos, lstrlen(oldstr) );
		output.Insert( pos, newstr );

	return output;

The function's implementation is rather simple: it creates several copies of the strings. If you need a memory- and speed- optimized replace function, this one is probably not the best for you. Anyway, in my project, it worked just well.

Please feel free to ask any questions you have by e-mail:


  • 25th January, 2000: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Uwe Keim
Chief Technology Officer Zeta Producer Desktop CMS
Germany Germany
Uwe does programming since 1989 with experiences in Assembler, C++, MFC and lots of web- and database stuff and now uses ASP.NET and C# extensively, too. He has also teached programming to students at the local university.

In his free time, he does climbing, running and mountain biking. Recently he became a father of a cute boy.

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Comments and Discussions

GeneralEndlich !!! Pin
plattenbomber15-May-10 2:36
memberplattenbomber15-May-10 2:36 
GeneralRe: Endlich !!! Pin
Uwe Keim15-May-10 3:09
mvpUwe Keim15-May-10 3:09 
GeneralMy vote of 1 Pin
Horia Tudosie24-Nov-09 5:36
memberHoria Tudosie24-Nov-09 5:36 
Regex is faster and better
GeneralA more simple alternative... Pin
skjpatel30-May-08 5:37
memberskjpatel30-May-08 5:37 
Questionwhy this code not work in UNICODE,_UNICODE setting? Pin
Pankaj.Jain13-Jun-07 22:46
memberPankaj.Jain13-Jun-07 22:46 
GeneralMore Efficient Version Pin
pwensing28-Apr-06 9:49
memberpwensing28-Apr-06 9:49 
GeneralThanks for the code Pin
Code4Food15-Nov-05 18:38
memberCode4Food15-Nov-05 18:38 
QuestionIncludes/Namespaces? Pin
Darth_Sulfur5-Sep-05 15:28
memberDarth_Sulfur5-Sep-05 15:28 
AnswerRe: Includes/Namespaces? Pin
Christian Graus5-Sep-05 15:40
memberChristian Graus5-Sep-05 15:40 
GeneralRe: Includes/Namespaces? Pin
Darth_Sulfur6-Sep-05 11:09
memberDarth_Sulfur6-Sep-05 11:09 
GeneralRe: Includes/Namespaces? Pin
Christian Graus6-Sep-05 12:08
memberChristian Graus6-Sep-05 12:08 
GeneralRe: Includes/Namespaces? Pin
Darth_Sulfur7-Sep-05 12:27
memberDarth_Sulfur7-Sep-05 12:27 
GeneralRe: Includes/Namespaces? Pin
Christian Graus7-Sep-05 13:47
memberChristian Graus7-Sep-05 13:47 
GeneralRe: Includes/Namespaces? Pin
Darth_Sulfur8-Sep-05 14:22
memberDarth_Sulfur8-Sep-05 14:22 
GeneralRe: Includes/Namespaces? Pin
Christian Graus8-Sep-05 14:27
memberChristian Graus8-Sep-05 14:27 
QuestionBug correction? Pin
petermcwerner28-Jul-05 2:35
memberpetermcwerner28-Jul-05 2:35 
AnswerRe: Bug correction? Pin
AberAber26-Nov-13 19:22
memberAberAber26-Nov-13 19:22 
GeneralBug Pin
Peter Werner27-Jul-05 9:18
sussPeter Werner27-Jul-05 9:18 
Generalwhy MakeLower() can not work Pin
David 200817-Mar-04 7:30
memberDavid 200817-Mar-04 7:30 
GeneralBug Pin
Wicket_19-Feb-03 21:53
sussWicket_19-Feb-03 21:53 
GeneralRe: Bug Pin
wicket_19-Feb-03 21:56
susswicket_19-Feb-03 21:56 
Generala little optimization Pin
KarstenK15-Apr-02 22:17
memberKarstenK15-Apr-02 22:17 
GeneralRe: a little optimization Pin
Uwe Keim15-Apr-02 22:23
sitebuilderUwe Keim15-Apr-02 22:23 
GeneralGood but a little bit slow Pin
Braulio Díez22-Nov-01 23:33
memberBraulio Díez22-Nov-01 23:33 

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