See the following sample code.
it will match the file name starting with dump and followed by some text and ending with.txt

#!/usr/bin/perl
use strict;
use warnings;


my @files = qw(dump123.txt abc dump124.txt 123 xyz 12dumpa.txt);

foreach (@files)
{
    if ( $_ =~ m/^dump.*txt$/)
    {
        print $_."\n";
    }
}
<br>
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--sugumar--