Provided you do read perlre and the other fine references so that you have a basis for understanding, you might find YAPE::Regex::Explain (by our own japhy) to be of use.
perl -MYAPE::Regex::Explain -e "print YAPE::Regex::Explain->new(shift)->explain;" "^\s*$"
yields
The regular expression:
(?-imsx:^\s*$)
matches as follows:
NODE EXPLANATION
----------------------------------------------------------------------
(?-imsx: group, but do not capture (case-sensitive)
(with ^ and $ matching normally) (with . not
matching \n) (matching whitespace and #
normally):
----------------------------------------------------------------------
^ the beginning of the string
----------------------------------------------------------------------
\s* whitespace (\n, \r, \t, \f, and " ") (0 or
more times (matching the most amount
possible))
----------------------------------------------------------------------
$ before an optional \n, and the end of the
string
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------
--
I'd like to be able to assign to an luser
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