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  1. or download this
    perl -Dx somescript.pl
  2. or download this
        use strict;
    use Data::Dumper;
...

    'abc123def456' =~ /(?<=f)(\d+)/;
    print "$1\n";
  3. or download this
    Compiling REx `(?<=f)(\d+)'
size 13 first at 1
...
Match successful!
456
Freeing REx: `(?<=f)(\d+)'