\S A non-whitespace character
\h An horizontal white space
\H A non horizontal white space
+ \N A non newline (like . without /s)
\v A vertical white space
\V A non vertical white space
\R A generic newline (?>\v|\x0D\x0A)
=item *
I<Mastering Regular Expressions> by Jeffrey Friedl
-(F<http://regex.info/>) for a thorough grounding and
+(F<http://oreilly.com/catalog/9780596528126/>) for a thorough grounding and
reference on the topic.
=back