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  1. or download this
    my $match = /#(\S*)/ ? $1 : "";
  2. or download this
    / ^ [^#]* \#? ( \S* ) /x;
say $1;
  3. or download this
    /()/; /#(\S*)/;
say $1;
  4. or download this
    /#(\S*)/ || /()/;
say $1;
  5. or download this
    my $match = /#(\S*)/ ? $1 : "";
say $match;
  6. or download this
    my $match = /#\K\S*/ ? $& : "";
say $match;
  7. or download this
    my ( $match ) = /#(\S*)/;
say $match;
  8. or download this
    my $match = /#(\S+)/ ? $1 : "";
say $match;
  9. or download this
    my $match = /#(\w+)/ ? $1 : "";
say $match;
  10. or download this
    / ^ (?: (?! \#\S ). )* \#? ( \S* ) /x;   # /#(\S+)/
say $1;
  11. or download this
    / ^ (?: (?! \#\w ). )* \#? ( \w* ) /x;   # /#(\w+)/
say $1;