/tmp>touch foo.txt
/tmp>mkdir bar.txt
/tmp>ls -lF
[...]
drwxr-xr-x 2 alex   users     40 Dec 23 10:16 bar.txt/
-rw-r--r-- 1 alex   users      0 Dec 23 10:16 foo.txt
[...]
/tmp>perl -E 'say for glob "*.txt"'
bar.txt
foo.txt
/tmp>perl -E 'say for grep -f,glob "*.txt"'
foo.txt
/tmp>