Problem Statement

Walk a given directory and print the names of files matching a given pattern.
(How is "pattern" defined? substring match? DOS pattern? BASH pattern? ZSH pattern? Perl regular expression?)

Note: This task is for non-recursive methods.   These tasks should read a single directory, not an entire directory tree.
Note: Please be careful when running any code presented here.

Let's start with the solution:

$$ MODE TUSCRIPT
files=FILE_NAMES (+,-std-)
fileswtxt= FILTER_INDEX (files,":*.txt:",-)
txtfiles= SELECT (files,#fileswtxt)