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  1. or download this
    Win8 Strawberry 5.8.9.5 (32)  Mon 08/16/2021 20:36:57
    C:\@Work\Perl\monks
    ...
    ("2021-08-19 a=b", "2021-08-19", undef)
    ("2021-08-20 a=", "2021-08-20", undef)
    ("2021-08-21 ", "2021-08-21", undef)
    
  2. or download this
    >perl -Mstrict -Mwarnings
    use Data::Dump qw(dd);
    ...
    ("2021-08-19 a=b", "2021-08-19", "b")
    ("2021-08-20 a=", "2021-08-20", undef)
    ("2021-08-21 ", "2021-08-21", undef)
    
  3. or download this
    >perl -Mstrict -Mwarnings
    use Data::Dump qw(dd);
    ...
    ("2021-08-19 a=b", "2021-08-19", "b")
    ("2021-08-20 a=", "2021-08-20", undef)
    ("2021-08-21 ", "2021-08-21", undef)