@item /@var{regexp}/[@var{offset}]
Create an output file containing the current line up to (but not
including) the next line of the input file that contains a match for
-@var{regexp}. The optional @var{offset} is a @samp{+} or @samp{-}
-followed by a positive integer. If it is given, the input up to the
+@var{regexp}. The optional @var{offset} is an integer.
+If it is given, the input up to (but not including) the
matching line plus or minus @var{offset} is put into the output file,
and the line after that begins the next section of input.