>perl -mre=debug -e '/ab+[cd]/'
    Compiling REx `ab+[cd]'
    size 15 first at 1
        1: EXACT <a>(3)
        3: PLUS(6)
        4:   EXACT <b>(0)
        6: ANYOF[cd](15)
       15: END(0)
    anchored `ab' at 0 floating `b' at 1..2147483647 (checking anchored) minlen 3
   Freeing REx: `ab+[cd]'

##</code><code>##

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

##</code><code>##

C:\>perl -mre=debug -e "/x+/"
Freeing REx: `,'
Compiling REx `x+'
size 4 first at 2
   1: PLUS(4)
   2:   EXACT <x>(0)
   4: END(0)
anchored `x' at 0 (checking anchored) plus minlen 1
Freeing REx: `x+'

##</code><code>##

C:\>perl -mre=debug -e "/x*/"
Freeing REx: `,'
Compiling REx `x*'
size 4 first at 1
   1: STAR(4)
   2:   EXACT <x>(0)
   4: END(0)
minlen 0
[snip]