How to write a complex regular expression for validation?

Question

Regular Expressions

Hello. Please help me write a regular expression. There is a requirement https://drive.google.com/file/d/1--wl3D-ra9dGqE7cC... Need where UIN

Now UIN looks like this "(^$)|(^[0-9]{20}$ )|(^[0-9]{25}$)"

Is it possible to make these regular expressions?

Answer 1

^0$|^[1-9](?:[0-9]{3}|[0-9]{19}|[0-9]{24})$|^[0-9][1-9](?:[0-9]{2}|[0-9]{18}|[0-9]{23})$|^[0-9]{2}[1-9](?:[0-9]|[0-9]{17}|[0-9]{22})$|^[0-9]{3}[1-9](?:|[0-9]{16}|[0-9]{21})$|^[0-9]{4}[1-9](?:[0-9]{15}|[0-9]{20})$|^[0-9]{5}[1-9](?:[0-9]{14}|[0-9]{19})$|^[0-9]{6}[1-9](?:[0-9]{13}|[0-9]{18})$|^[0-9]{7}[1-9](?:[0-9]{12}|[0-9]{17})$|^[0-9]{8}[1-9](?:[0-9]{11}|[0-9]{16})$|^[0-9]{9}[1-9](?:[0-9]{10}|[0-9]{15})$|^[0-9]{10}[1-9](?:[0-9]{9}|[0-9]{14})$|^[0-9]{11}[1-9](?:[0-9]{8}|[0-9]{13})$|^[0-9]{12}[1-9](?:[0-9]{7}|[0-9]{12})$|^[0-9]{13}[1-9](?:[0-9]{6}|[0-9]{11})$|^[0-9]{14}[1-9](?:[0-9]{5}|[0-9]{10})$|^[0-9]{15}[1-9](?:[0-9]{4}|[0-9]{9})$|^[0-9]{16}[1-9](?:[0-9]{3}|[0-9]{8})$|^[0-9]{17}[1-9](?:[0-9]{2}|[0-9]{7})$|^[0-9]{18}[1-9](?:[0-9]|[0-9]{6})$|^[0-9]{19}[1-9](?:|[0-9]{10})$|^[0-9]{20}[1-9][0-9]{4}$|^[0-9]{21}[1-9][0-9]{3}$|^[0-9]{22}[1-9][0-9]{2}$|^[0-9]{23}[1-9][0-9]$|^[0-9]{24}[1-9]$

https://regex101.com/r/s26Z9k/1