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  1. or download this
        /\bd4\b.*\bb2\b|\bb2\b.*\bd4\b/
  2. or download this
        /\bc3\b.*(\bd4\b.*\be5\b|\be5\b.*\bd4\b)
    |\bd4\b.*(\bc3\b.*\be5\b|\be5\b.*\bc3\b)
    |\be5\b.*(\bc3\b.*\bd4\b|\bd4\b.*\bc3\b)/x
  3. or download this
        my $want= qr/\b(?:c3|d4|e5)\b/;
    my $match= qr/$want.*?$want.*?$want/;