Filter filenames by pattern

try

@files = grep {!/\.xh$/} <$MYDIR/abc*>;

where MYDIR is a string containing the path of your directory.

opendir(MYDIR, $newpath); my @files = grep(/abc*.*/,readdir(MYDIR)); #DOES NOT WORK

You are confusing a regex pattern with a glob pattern.

#!/usr/bin/perl

use strict;
use warnings;

opendir my $dir_h, '.'
    or die "Cannot open directory: $!";

my @files = grep { /abc/ and not /\.xh$/ } readdir $dir_h;

closedir $dir_h;

print "$_\n" for @files;

opendir(MYDIR, $newpath) or die "$!";
my @files = grep{ !/\.xh$/ && /abc/ } readdir(MYDIR);
close MYDIR;
foreach (@files) { 
   do something
}