Regex that matches certain trailings of words with certain length?

Question

How can I write a regex that matches the "e" trailings of every word, exept the "e" trailings of words with 2 or 3 letters?

Example:

abcdeeee: Full match for "eeee"

more: Full match for "e"

pie: No match

me: No match

Answer 1

Use a lookaround assertion:

e+(?<=\w{4})\b

This matches e characters if afterwards there have been 4 word characters before the final e. The \b makes sure it ends at a word boundary

Demo