Test whether a glob has any matches in bash

Question

If I want to check for the existence of a single file, I can test for it using test -e filename or [ -e filename ].

Supposing I have a glob

Answer 1

#!/usr/bin/env bash

# If it is set, then an unmatched glob is swept away entirely -- 
# replaced with a set of zero words -- 
# instead of remaining in place as a single word.
shopt -s nullglob

M=(*px)

if [ "${#M[*]}" -ge 1 ]; then
    echo "${#M[*]} matches."
else
    echo "No such files."
fi