I find '-Dr' far more useful than 'YAPE::Regex::Explain'.
The latter just parrots back what it was given, but then in
English. '-Dr' shows how perl compiles it. As shown in the
thread 'YAPE::Regex::Explain' doesn't notice the overlap between \S and \W, not even that '*' is mentioned twice.
'-Dr' shows what's really going on, although the output is
sometimes hard to grog.
And '-Dr' really shines at runtime, showing how Perl actually
matches a regexp.
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