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  1. or download this
    s/,.*?(?:(cd).*?)??,/=$1=/
  2. or download this
    s;,.*?(?:(cd).*?)??,;=@{[$1 // '']}=;
  3. or download this
    s/,.*?(?:(cd).*?)??,/$1 ? "=$1=" : "=="/e  # without that @{[]} trick