Added more documentation to the code. Changed lookahead() to _lookahead(), same for lookbehind() Added a test so that demo() is called if this file is executed.
Added more documentation to the code.
Changed lookahead() to _lookahead(), same for lookbehind()
Added a test so that demo() is called if this file is executed.


svn/trunk@279

nltk/nltk,nltk/nltk,nltk/nltk