$mask public property
The input mask (e.g. '99/99/9999' for date input). The following characters can be used in the mask and are predefined:
a: represents an alpha character (A-Z, a-z)
9: represents a numeric character (0-9)
*: represents an alphanumeric character (A-Z, a-z, 0-9)
[ and ]: anything entered between the square brackets is considered optional user input. This is based on the optionalmarker setting in $clientOptions. Additional definitions can be set through the $definition