not use this feature without looking at the filtered version first to
ensure that it's what you really want.</para>
-1<para>The string argument of a <option>-r</option> option is
+<para>The string argument of a <option>-r</option> option is
interpreted as a comma-separated list of line numbers or line number
ranges to which the string filtering is to be limited. A range of the
form "<num1>-" is taken to signify all lines from line