nl_tokens: Performs rot13 encoding / decoding
pl_tokens: function rot13 ( str ) { return str . replace ( / [a-zA-Z] / g , function ( c ) { return <mask> . fromCharCode ( ( c <= 'Z' ? 90 : 122 ) >= ( c = c . charCodeAt ( 0 ) + 13 ) ? c : c - 26 ) ; } ) ; }