Regex for the following string (digit+"dot" )

ID_number: 111.2.003

^ I need help creating a regex that will select anything on the logs that starts with "ID_number: " and ends with ".003" .
So the value that changes is the "111.2"

Cannot get any output with what I’ve tried

>Solution :

The following regular expression will match strings that start with "ID_number:" and end with ".003"

ID_number: (\d+(\.\d+)*)\.003