fixed a small bug in the regexp.

modules/roll/roll.sh

@@ -12,7 +12,7 @@ roll_dice() {
 }
 
 rollString="${3##* }"
-if ! [[ "$rollString" =~ ^[1-9]+[dD][1-9][0-9]*$ ]]; then
+if ! [[ "$rollString" =~ ^[1-9][0-9]*[dD][1-9][0-9]*$ ]]; then
     msg "$2" "${1}: Usage is roll #d# where # is greater than 0."
     else
     msg "$2" "$1:: I rolled ${rollString} and got a total of $(roll_dice ${rollString})."