Simple validations made easier

Validate the following:

1. Email string --> Params: (email)
2. Password string --> Params: (pwd) --> Rules applied: Check a password between 7 to 15 characters which contain at least one numeric digit and a special character.
3. validates the length of the string --> Params: (val, len)
4. Check the number of digits after decimal point --> Params: (val, len) --> Rules applied: Val is the decimal number and len is the lenth to assert with after decimal point.
5. Check the number of digits before decimal point --> Params: (val, len) --> Rules applied: Val is the decimal number and len is the lenth to assert with before decimal point.