ReplaceText replaces all instances of string AFromText to string AToText in the source string AText and returns this value as the result. The replacement is case insensitive.

function ReplaceText(const AText: string; const AFromText: string; const AToText: string): string;

AnsiString ReplaceText(const AnsiString AText, const AnsiString AFromText, const AnsiString AToText);