Hi, thanks for your time! I am trying to match against filenames, from files that are in the path I specify. I modified my script to

  
$match =~/MV(\d{4})/;
$moved = $1;
print "$moved \n";
[download]

but although I initialise my $match outside of the loops, I still get the same error as described initially :(

Try

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

my $id   = "AC";
my $root = '/home/results/initial/';

for my $i (2..3){
  for my $k (1..3){
    my $path = $root.sprintf "%s%04d/F%05d",$id,$i,$k;
    print "$path\n";

    for (glob "$path/MV*"){
      print "$1\n" if /MV(\d{4})/;
    }
    
  }
}
[download]

poj

What is the value in $match?

What do you expect the value in $match to be?

As hippo already mentioned, you seem to be highly confused about how to read entries in a directory. See glob, or opendir and readdir.

... I still get the same error as described initially ...

From the OP: '... I'm getting a "Use of uninitialized value $_ in pattern match (m//)" error.'
If you're really still getting this exact "error" (a warning, actually), then you still have a
    /MV(\d{4})/;
statement lurking somewhere in your code that is still trying to implicitly match against the  $_ variable which you have still not initialized. What line number is associated with the warning message? Look at (or near) that line for the offending statement.

---

Give a man a fish:  <%-{-{-{-<