Is it true that /abbb/ does not match /ab+c?/

Question

This is from an online quiz I am taking. Makes no sense to me though, because abbb:

1. Starts with mandatory a - check!
2. Has one or more b's after a - check!
3. Has 0 occurance of c - check!

Thoughts? Am I missing something here?

Answer 1

There are multiple online regex tools you can use to test that out.

https://regex101.com/ is an ad-free site with multiple regex implementations (php, javascript, python, and golang). Here's a link with your test case: https://regex101.com/r/9uI9Uw/1.

Your reasoning is correct and abbb is a match for the regex /ab+c?/.

Javascript snippet:

const s = 'abbb'
console.log(s.match(/ab+c?/))

Answer 2

According to your description,I think that you want is this.

^ab+[^c]*$