I'm trying to perform a regex replacement. Therefor I defined the following expression:
^(?:9903[0]*([0-9]*)){20}$
This Expression should match to
99030000000000000001
99030000000000000011
99030000000000000111
99030000000000001111
99031111111111111111
but not to
9903111111111111111
In fact, the expression above does not work until I either use {1,20} as quantifier or remove it completely. But as I want to check the length of the whole string without knowing the length of [0]* nor the length of the variable, there's something wrong with my expression.
Many thanks for your help in advance.
D
There are multiple things wrong with your initial regex.
The {} part is applied to en entire part between brackets. So your current regex requires that this part:
(?:9903[0]*([0-9]*))
Is repeated 20 times in its entirety, which is not what you want.
Then this part:
[0]*([0-9]*)
Makes little sense, do you want to capture the number after 9903 without the leading zeros? Then require that the capture starts with a non-zero number. [0] is a character class with just one character, equivalent to just 0.
Concluding, I would do it like so:
^9903(?=[0-9]{16}$)0*([1-9][0-9]*)$
Edit: I realized later that if it's required to match 99030000000000000000 (get 0 in your capture group) then you need this:
^9903(?=[0-9]{16}$)0*([0-9]+)$