% perl -Mre=debug -e '/.{3}/'
Freeing REx: `","'
Compiling REx `.{3}'
size 4 Got 36 bytes for offset annotations.
first at 3
   1: CURLY {3,3}(4)
   3:   REG_ANY(0)
   4: END(0)
minlen 3
Offsets: [4]
        2[3] 0[0] 1[1] 5[0]
Freeing REx: `".{3}"'