Mention unspace disallowed in regex (except \#)
Mention unspace disallowed in regex (except \#)

The current engine disallows unspace in regexex as too ambiguous.
This is fine for actual whitespace, but is counterintuitive when people
try to backslash the # character.  So \# is now specifically allowed
to match a literal # character.

prammer/specs,tokuhirom/specs,tokuhirom/specs,prammer/specs,perl6/specs,tokuhirom/specs,perl6/specs,prammer/specs