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    >perl -mre=debug -e '/ab+[cd]/'
    Compiling REx `ab+[cd]'
...
       15: END(0)
    anchored `ab' at 0 floating `b' at 1..2147483647 (checking anchore
+d) minlen 3
   Freeing REx: `ab+[cd]'

" "*id*: *TYPE* *OPTIONAL-INFO* (*next-id*)

C:\>perl -mre=debug -e "/x+/"
Freeing REx: `,'
...
   4: END(0)
anchored `x' at 0 (checking anchored) plus minlen 1
Freeing REx: `x+'

C:\>perl -mre=debug -e "/x*/"
Freeing REx: `,'
...
   4: END(0)
minlen 0
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