***** 1 *****
Compiling REx `1'
Guessing start of match, REx "1" against "1"...

***** 2 *****
Compiling REx `2'
Guessing start of match, REx "2" against "2"...

***** 3 *****
Compiling REx `\d'
Matching REx "\d" against "3"

***** 4 *****
Matching REx "\d" against "4"     <--- No "Compiling" before this.