How do I delete all selected lines in kwrite? I selected with a regexp but there is no Delete menue entry and the delete key does nothing. It is also not documented in the kde docukmentation unfortunately.
CtrlX removes text (yanks it) and that one is also available via menu AltET (Edit>cut).
Backspace or Del key deletes it for me.
You cannot select lines with a regex pattern in kwrite 
- Iif you search with regex, you will find text, not select it…
So it seems you were merely confused…
To delete stuff with regex:
- CtrlR for Replace dialog
- Regular Expression 🗹
- Find your text (all lines with ‘fudge’
^.*fudge.*$ - If you want to replace them with nothing, then leave Replace empty
- Replace All.
So go and try it again, then come back and mark it 
