synthetic stclass "ANYOF[a-z][]".
Final program:
   1: BOL (2)
   2: OPEN1 (4)
   4:   PLUS (16)
   5:     ANYOF[a-z][] (0)
  16: CLOSE1 (18)
  18: STAR (20)
  19:   DIGIT (0)
  20: EOL (21)
  21: END (0)
floating ""$ at 1..2147483647 (checking floating) stclass ANYOF[a-z][] anchored(BOL) minlen 1