Regex for matching a word with multiples of each letter

Sorry I have been playing around with regex for a while now and not getting anywhere.

Say my word is ‘NEIGH’:

nnnneeeiggghhhhh 
Neeeiighh
Neigh
Neeeighh
Nnnneeeigh

Any of the above should be able to match ^.

My closest example:

const regex = /n+e+i+g+h?(.)\1/gm;

if (regex.exec(message.content) !== null) {
  // Do something
}

>Solution :

You can use

/n+e+i+g+h+/i
/\bn+e+i+g+h+\b/i

where + quantifier is used after each letter, and the i flag enables case insensitive matching.

If the whole word must be matched, add \b word boundaries.

See the regex demo.