this looks like a bug to me:


~/eg/ruby > cat bug.rb

  # greedy gsub works fine a bos
  k1, p1 = '=foo', %r/^(=*)/
  p(p1.match(k1).to_a)
  p(k1.gsub(p1, '!'))

  # greedy gsub fails at eos
  k0, p0 = 'foo=', %r/(=*)$/
  p(p0.match(k0).to_a)
  p(k0.gsub(p0, '!'))

~/eg/ruby > ruby bug.rb

  ["=", "="]
  "!foo"
  ["=", "="]
  "foo!!"

~/eg/ruby > ruby -v
ruby 1.8.0 (2003-10-15) [i686-linux]



-a
-- 

ATTN: please update your address books with address below!

===============================================================================
| EMAIL   :: Ara [dot] T [dot] Howard [at] noaa [dot] gov
| PHONE   :: 303.497.6469
| ADDRESS :: E/GC2 325 Broadway, Boulder, CO 80305-3328
| STP     :: http://www.ngdc.noaa.gov/stp/
| NGDC    :: http://www.ngdc.noaa.gov/
| NESDIS  :: http://www.nesdis.noaa.gov/
| NOAA    :: http://www.noaa.gov/
| US DOC  :: http://www.commerce.gov/
|
| The difference between art and science is that science is what we
| understand well enough to explain to a computer.  
| Art is everything else.  
|   -- Donald Knuth, "Discover"
|
| /bin/sh -c 'for l in ruby perl;do $l -e "print \"\x3a\x2d\x29\x0a\"";done' 
===============================================================================