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feedparser defines four regexs for end-of-line, but two are redundant.
NLCRE checks for the three common line endings.
NLCRE_crack also captures the line ending.
NLCRE_eol also adds a $ to ensure it is at the end.
NLCRE_bol ... is identical to NLCRE_crack.
It should either use a ^ to insist on line-start, or be explicitly the 
same. (e.g., NLCRE_bol=NLCRE_crack.) (It gets away with not listing the ^ 
because the current code only uses NLCRE_bol.match.
(Actually, if the regexes are considered private, then the current code 
could just use the bound methods directly ... setting NLCRE_bol to the
 .match method, NLCRE_eol to the .search method, and NLCRE_crack to the
 .split method.)