Javascript regex to match a string that ends with some characters but not with a particular combination of those

Let's say using Javascript, I want to match a string that ends with [abcde]* but not with abc.

So the regex should match xxxa, xxxbc, xxxabd but not xxxabc.

I am utterly confused.

Edit: I have to use regex for some reason, i cannot do something if (str.endsWith("abc"))

javascript regex

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