nl_tokens: Returns all the characters found in one string but not the other .
pl_tokens: function differenceFromString ( s , other ) { if ( typeof other !== 'string' || typeof s !== 'string' ) return s ; var sarr = s . split ( '' ) , oarr = other . split ( '' ) ; return libs . array . difference ( sarr , oarr ) . <mask> ( '' ) ; }