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  1. or download this
      s /\\([^\\tnrfbae])|\\\\([tnrfbae])
    /(my$x=defined($1)?$1:$2)=~y#tnrfbae#\t\n\r\f\b\a\e#;$x;
    /gex;
  2. or download this
      s /\\([^\\tnrfbae])|\\\\([tnrfbae])|\\([tnrfbae])
    /(my$x=defined($1)?$1:$2?$2:'')=~y#tnrfbae#\t\n\r\f\b\a\e#;$x?$x:$
+3;
    /gex;