Here is one way, by using grep on your dir and file lists. It's a start that should show the way. The logic is greatly simplified by separating the subdir and file search. I'm sure this code can be condensed, but your list of requirements is so big, you are better off breaking it into small steps to aid in debugging. 
#!/usr/bin/perl
use warnings;
use strict;

# goes from current dir, and looks thru
# a subdir named 7, for subdirs starting with 
# Jan_2009_,  then goes into that subdir and finds
# files begiining with a or b or c
# making your particular regexes is up to you

my $topdir = '7';
my @subdirs = get_sub_dirs($topdir);

sub get_sub_dirs {
 my $dir = shift;
 opendir my $dh, $dir or die "Error: $!";
 my @dirs =  readdir $dh;
 @dirs = grep /^Jan_2009_(.*)$/,@dirs; 
 closedir $dh;
return @dirs;
}

print "@subdirs\n";

my @files;
foreach my $dir(@subdirs){
  opendir my $dh, "$topdir/$dir" or die "Error: $!";
  @files = readdir $dh;
  @files = grep /^(a|b|c)(.*)$/,@files; 
  closedir $dh;
 }
 
print "@files\n"; 

#Now you can regex your files, etc

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In reply to Re: Processing data in on dir and copying, then processing into another dir by zentara
in thread Processing data in on dir and copying, then processing into another dir by lomSpace

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