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  1. or download this
    perl -le'$_="ABC\nDEF"; s/C\$\n^D/-/m; print'
perl -le'$_="ABC\nDEF"; s/C$[\n]^D/-/m; print'
  2. or download this
    perl -le'$_="ABC\nDEF"; s/C$ \n^D/-/mx; print'
perl -le'$_="ABC\nDEF"; s/C(?:$)\n^D/-/m; print'
perl -le'$_="ABC\nDEF"; s/C$(?:\n)^D/-/m; print'
  3. or download this
    perl -le'$_="ABC\nDEF"; s/C$^D/-/m; print'