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  1. or download this
    Unix: octal \012       hex 0xA      dec 10      LF      may be \n
Dos:  octal \015\012   hex 0xD0xA   dec 13 10   CRLF    may be \r\n
Max:  octal \015       hex 0xD      dec 13      CR      may be \r
  2. or download this
      $textfield =~ s/\015\012|\015|\012//g;

  If you prefer hex to octal :-)

  $textfield =~ s/\xD\xA|\xD|\xA//g;
  3. or download this
      In expanded commented /x form:

...
                /          # with literal ''
                /xg;       # /x allow comments, /g do globally