Expression List :
Minimum 3 Character Validation :    ^[a-zA-Z0-9]{3,}

Only 6 Numbers allowed :    [0-9]{6,}

Only Numbers Allowed :    ^\d+$

Date Validator : ^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$  (dd/MM/yyyy)        (dd/mm/yyyy)

Date Validator :  ^([0-9]{1,2})[./-]+([0-9]{1,2})[./-]+([0-9]{2}|[0-9]{4})$       (mm/dd/yyyy)

Mail Validator  :  

"^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$"