I need to allow callers to enter their ID. It is 7 characters long and is a mixture of letters and numbers but there is a structure to it.
Example: F0G0000
- The first character is always a letter.
- The second character is always a number.
- The third can be ether a letter or number.
- The last 4 characters are always numbers.
Is there any thing that i could do to the grammar to make it switch between letters and numbers according to the structure above?
Absolutely:
Disclaimer: I haven't tested it.