Question

I have

text text text [text text] \n
text text text [text text] \n

I want

text text text \n
text text text \n

What RE can I use?

Answer 1

The following works regardless of whether the \n is the end of line or a backslash and a letter ‘n’:

sed 's/\[.*] //' $file

The pattern looks for an open square bracket followed by any sequence of characters up to the last close square bracket and a following space (if there are several). You could refine the ‘.*‘ into ‘[^]]*‘ to match anything that is not a close square bracket; this only deletes to the first close square bracket.