SCP not working with RegEx

I've been trying to copy some remote files to localhost using regex expression, but it reads the regex as if it would be a regular string and does not find any files matching that. Any ideas why? file-download

#!/bin/bash

scp "student@172.18.186.10:/home/student/download-this/[a-zA-Z0-9]+\.tar\.gz" .

I have also tried copying from localhost to remote device, but still the regex won't work with scp file-upload

scp "/root/scripts/this[XYZ]_[0-9]{1,5}\.txt" fs@10.11.10.2:/home/fs/upload