paragraphs.el: do forward-sentence and friends not work?

[David Reitter]

Maybe I misunderstand the purpose of this function, but `forward- 
sentence' doesn't work for me. It always jumps to the end of the  
paragraph rather than to the end of the sentence.

This is in recent GNU Emacs 22 CVS builds.

It appears that there may be one or more bugs in the definition of  
`sentence-end' and the default of sentence-end-base.

(sentence-end) returns:

"\\([.?!][]\"'””)}]*\\($\\| $\\|	\\|  \\)\\| 
[。．？！。．？！。．？！����]+\\)[ 	
]*"

Aren't . and ? supposed to be escaped?

Even when escaped, I couldn't make it work. However, if I set sentence- 
end:

(setq sentence-end "\\([\\.\\?!][ \\\\]\\)\\|\n")

things work alright (for basic sentences).

Maybe I am an Emacs-specific meaning associated with "sentence" has  
eluded me so far. Or, is there something broken in M-e and M-a?