From Forum Nokia Wiki

Richtexteditor offers many functions that can set the text bold, italics, underline, etc... One such good function is highlighting the text. It's very helpful if we want to show a link (hyperlink) like effect. Additional coding is required with relevent data structures to implement moving from one word to the other or moving from one highlighted word to some other one.

The following function applies/removes highlighting in a CEikRichTextEditor.

void CMyRichTextEditor::SetHighlightOn(TBool aOn)
{
SetSmallFontOn();
iCharFormatMask.SetAttrib(EAttFontHighlightColor);
iCharFormatMask.SetAttrib(EAttFontHighlightStyle);
 
if (aOn)
{	
iCharFormat.iFontPresentation.iHighlightColor=TLogicalRgb( TRgb(0,255,255) );
iCharFormat.iFontPresentation.iHighlightStyle=TFontPresentation ::EFontHighlightNormal;
}
else
{
iCharFormat.iFontPresentation.iHighlightColor=KRgbWhite;
iCharFormat.iFontPresentation.iHighlightStyle=TFontPresentation ::EFontHighlightNone;
}
}