How to add a particular word starting and end position of notepad++?

1. Press CTRL + H to open Find/Replace Dialog box.

2. Click "Regular expressions" checkbox near to the bottom of the dialog box.

3. Then To add your particular word, "test" (example) to the beginning of each line,
     type `^` in the "Find what" field,
     and "test" in the "Replace with" field. Just click hit "Replace All". (Alt+A Shortcut)

4. To add particular word ,"test" end of each line, type `$` in the "Find what" field,  and "test" in the       "Replace with" field. Then hit "Replace All".

That's All!