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the following conversion specifiers are recognized in the format string:
%a - abbreviated weekday name according to the current locale

by default, a whitespace character is any character that the c library function isspace() recognizes, though it is possible to compile pcre with alternative character type tables. normally isspace() matches space, formfeed, newline, carriage return, horizontal tab, and vertical tab. perl 5 no longer includes vertical tab in its set of whitespace characters. the \v escape that was in the perl documentation for a long time was never in fact recognized. however, the character itself was treated as whitespace at least up to 5.002. in 5.004 and 5.005 it does not match \s.
though binary zero characters are supported in the subject string, they are not allowed in a pattern string because it is passed as a normal c string, terminated by zero.