Req ex for 9+2 Numerci plus decimal values

Question

I am looking for a regular expression with the following requirements:

1. 9 + 2 after decimal
2. If amount is zero, it should be invalid

I tried ^[1-9][0-9]*$ but it does work.

Answer 1

Use

^(?![0.]+$)\d{1,9}\.\d{2}$

See proof

Explanation

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    [0.]+                    any character of: '0', '.' (1 or more
                             times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
    $                        before an optional \n, and the end of
                             the string
--------------------------------------------------------------------------------
  )                        end of look-ahead
--------------------------------------------------------------------------------
  \d{1,9}                  digits (0-9) (between 1 and 9 times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \.                       '.'
--------------------------------------------------------------------------------
  \d{2}                    digits (0-9) (2 times)
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string