sed: enhance s///NUMBER to handle ranges

[Dan Jacobson]

In sed we can do
s/ /  /3
to double the third blank on the line, or
s/ /  /g
to double all blanks on the line,
but there is no say,
s/ /  /3-
to double all the blanks starting at the third, because in Info it says
    `NUMBER'
          Only replace the NUMBERth match of the REGEXP.
In perl
       s/PATTERN/REPLACEMENT/egimosx
doesn't seem to do numbers.
$ echo 's/a/b/3'|/usr/bin/s2p
Unrecognized substitution command(3) at line 1

I.e. couldn't translate it to perl.

Anyways, it sure would be nice if sed could be enhanced to do ranges
instead of a single occurrence.  Better make it deluxe with inclusive
and exclusive ranges, the works.
-- 
http://jidanni.org/ Taiwan(04)25854780