Regex expression for 8 digits before decimal and 2 after decimal and whole string should not compute to zero

I need regex expression for the following :

• 8 digits before decimal
• 2 digits after decimal

\d{0,8}(\.\d{1,2})?$

this works for the above case , but I don't want the following strings to be accepted. The string should not result to zero.

• 0000.00 -> false
• 00.00 -> false
• 0.0 ->false

Another option is to assert not only dots and zeroes

^(?![0.]*$)\d{0,8}(?:\.\d{1,2})?$

Regex demo | Java demo

In Java

String regex = "^(?![0.]*$)\\d{0,8}(?:\\.\\d{1,2})?$";

If you want a match only, you can omit the capturing group and make it non capturing (?: