var entry = [ 'n000087',
  '1',
  '000055555',
  'admin',
  '1',
  '0',
  '2018/07/06',
  '08:53:14t' ];

entry = entry.map((item)=>{
    return item.replace('/\(?:[a-z])/g','');
});
console.log(entry);//does not remove n or t
console.log(entry[0].replace('/\(?:[a-z])/g','')); // does remove n