$ perl -Mre=debug -e " /larry.wall+!/  "
Compiling REx "larry.wall+!"
Final program:
   1: EXACT <larry> (4)
   4: REG_ANY (5)
   5: EXACT <wal> (7)
   7: PLUS (10)
   8:   EXACT <l> (0)
  10: EXACT <!> (12)
  12: END (0)
anchored "larry" at 0 floating "l!" at 9..2147483647 (checking anchored) minlen 11
Freeing REx: "larry.wall+!"