RegEx: Two of (Newline + Whitespace) + alphanumeric. Can't get it!

// 2 or more ( newline + 0 or more (spaces or tabs) )
// + any alphanumeric
const gRecordDelim = /(n[ t]*){2,}(?=w)/g;
// const gRecordDelim = /(n[ t]*n)/g;
// const gRecordDelim = /(n[ t]*){2,}(?=[A-Za-z0-9])/g;
// const gRecordDelim = /(n[ t]*){2,}n/g;
// const gRecordDelim = /n{2,}/g;
// const gRecordDelim = /([ t]*n[ t]*){2,}/g;