3 If <start> or <end> is a number, it specifies an
4 absolute line number (lines count from 1).
9 This form will use the first line matching the given
10 POSIX regex. If <end> is a regex, it will search
11 starting at the line given by <start>.
16 This is only valid for <end> and will specify a number
17 of lines before or after the line given by <start>.