I need all the possible combinations alphabets, numbers (a-z0-9) , _(underscore) and .(dot) which must satisfy the below conditions
Please use between 6 and 30 characters.
Please use only letters (a-z), numbers(0-9)
The first character should be a letter (a-z) or number.
The last character a letter (a-z) or number.
Thanks,
Subash