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  1. or download this
    use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr/\s(.:.+?)/ )->explain;
__END__
...
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)                        end of grouping
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  2. or download this
    $ perl -le"my $f = q!a b c d ee!; print substr $f, 1+rindex $f, q! !"
ee