Compiling REx `(est|\d)'
size 10 first at 3
   1: OPEN1(3)
   3:   BRANCH(6)
   4:     EXACT <est>(8)
   6:   BRANCH(8)
   7:     DIGIT(8)
   8: CLOSE1(10)
  10: END(0)
minlen 1
Compiling REx `(?:est|\d)'
size 7
   1: BRANCH(4)
   2:   EXACT <est>(7)
   4: BRANCH(6)
   5:   DIGIT(7)
   6: TAIL(7)
   7: END(0)
minlen 1
Compiling REx `est|\d'
size 6
   1: BRANCH(4)
   2:   EXACT <est>(6)
   4: BRANCH(6)
   5:   DIGIT(6)
   6: END(0)
minlen 1
Compiling REx `est'
size 3 first at 1
   1: EXACT <est>(3)
   3: END(0)
anchored `est' at 0 (checking anchored isall) minlen 3
Compiling REx `\d'
size 2 first at 1
   1: DIGIT(2)
   2: END(0)
stclass `DIGIT' minlen 1