Help for beginner to create Perl script

[vitalia]

Hello everyone, I really need help to create this syntax.
I am a beginner. I was able to write just simple code but I couldn't restrict the number of digits and letters.

What I need is:

All inputs should be verified. Any input which fails the verification should result in a suitable error message.

Customer Reference – 4 digits only
Title- between1 and 4 alphabetic characters(allo wed Dr, Lady, Lord, Miss, Mr,Mrs,Ms,Sir.
Surname- between 1 and 20 char.
Forename- between 1 and 20 char.
Sex- 1 char (M or F upper or lower case)
Date of birth in the format DD/MM/YYYY

If anyone knows how to limit the number of digits it would be very helpful.
Thanks for your time wise people,
Vitalia

[KevinADC]

I see this exact same question on various perl forums because it is some type of class/school work. Post whatever code you have so far to recieve some help with your class/school work.