CHANGE
C[HANGE] /old_text[/[new_text[/]]
CHANGE is an editing command that allows you to do a search and replace on the current line in the SQL buffer. The CHANGE command is also used to delete text. For example:
SQL> l 1* select dummy,smarty from duap SQL> c /duap/dual/ 1* select dummy,smarty from dual SQL> c /,smarty/ 1* select dummy from dual