- In read_regexp_block, if end_re is defined, then only end a block when   we see end_re (not when we see start_re).
- In read_regexp_block, if end_re is defined, then only end a block when
  we see end_re (not when we see start_re).


svn/trunk@5345

nltk/nltk,nltk/nltk,nltk/nltk