I\'m currently using a scanning software \"Drivve Image\" to extract certain information from each paper. This software enables certain Regex code to be run if needed. It se
Did some googling and from what I can grasp, the last parameter to the REGEXP.MATCH is the capture group to use. That means that you could use you own regex, without the \K, and just add a capture group to the number you want to extract.
\bOrdernr\s+(\S+)
This means that the number ends up in capture group 1 (the whole match is in 0 which I assume you've used).
The documentation isn't crystal clear, but I guess the syntax is
REGEXP.MATCH(, "REGEX", CaptureGroup)
meaning you should use
REGEXP.MATCH(, "\bOrdernr\s+(\S+)", 1)
There's a fair amount of guessing here though... ;)