Replace part of text with other text

Ok, I have two RichText-boxes, and when pressing a button I want to replace a certain part of the first RichTextBox with the content in the second. How do I do this?

Mike (Parksie) wrote this example for me:

Code:

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#include <String>
using namespace std;

bool StringFind(String sSearchIn, String sSearchFor, uint &nPos) {

                uint nTemp = sSearchIn.find(sSearchFor);
                If(nTemp < sSearchIn.length()) {
                        nPos = nTemp;
                        Return True;
                }

                Return False;
        }

bool Replace(String &sLine, String sReplaceWhat, String sReplaceWith) {

                uint nPos = 0;
                uint i = 0;
                While (StringFind(sLine, sReplaceWhat, nPos)) {
                        If(i > 100) break; // Something's gone wrong (sReplaceWhat ~= sReplaceWith)
                        sLine = sLine.replace(nPos, sReplaceWhat.length(), sReplaceWith);
                        i++;
                }
                If(i) Return True; Return False;
        }

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Have fun, and don't thank me, it was parksie's :D

Bugger...looks like VB-W just destroyed my capitalisation :rolleyes:

I think that's Geoff's VbWorld browser then ;)