Customer number=letter1x + number7x
Order date=day + dash + month + dash + year
Customer=title + space + first_name + space + (middle_name) + space + last_name

title=[Mr.|Mrs.|Mss.]
first_name=1{permitted-char2}100
middle_name=1{permitted-char3}100
last_name=
space=[ ]

day=[01-31]
month=[01-12]
year=4{permitted-number}4
dash=[-]

letter1x=1{permitted-char}1
number7x=7{permitted-number}7

permitted-char=[A-Z]
permitted-char2=[A-Z|a-z|']
permitted-char3=[A-Z|a-z| |'|-]
permitted-number=[0-9]