more regexp: sed trouble ?

[Peter]

My sed copy seems not to want to work in multi-line mode. Any ideas ?

plp at plp$ sed --version 
GNU sed version 4.0.9
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
plp at plp$ echo -e "a\n\n\nb"|sed -re 's/\n\n/yes/g'
a


b
plp at plp$ echo -e "a\na"|sed  -re '/.*/Ml'
a$
a
a$
a

-----

HUH ?

thanks,
Peter
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