Hi Monks!
I am trying to change parts of the file using something like the code here showing, is that a way to do it like this?
use stric;
use warnings;

my @files = qw( XY201308.TXT TW201308.TXT KG201308.TXT MM201308.TXT );


foreach my $file (@files) {

  # triyng to lower case the to letters and replace the digits with yy

  $file=~s/(\w{2})(\d+)/$1\lc($1),$2\lc(yy)/e;

  print "\n $file \n";
  
}

[download]
Thanks for looking!

In reply to RegEx match in files by Anonymous Monk

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