rnm "s/Blah Blah - \d{2} - //" "Blah Blah - 01 - Peter.txt" "Blah Blah - 02 - Lois.txt"

##</code><code>##

#!/usr/bin/perl -w

$op = shift or die "Usage: rename expr [files]\n";

chomp( @ARGV );
@ARGV = map glob, @ARGV;

for ( @ARGV ) {
  $was = $_;
  eval $op;
  die $@ if $@;
  rename ( $was, $_ ) unless $was eq $_;
}