Regex doesn't validate base64 not ending in =

[Chris Barth]

If you look at the regex, you'll see that it requires a segment that ends in a =. For example, QmCC is a valid base64 string, but this regex doesn't validate that string:

https://regex101.com/r/uGf7ne/1

However, ^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$ allows the last segment to not have to end in an =.

https://regex101.com/r/uGf7ne/2

I might also add that I've seen other people lift this regex for other uses (https://stackoverflow.com/a/29275028), which I'm also doing, thus I found this problem. In that case, it might be helpful to the greater community to make the regex more 'flavor compatible' by escaping some characters that other languages require, like so: ^(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$

I'd be happy to create a PR if so desired.

[Chris Barth]

Nevermind. I wasn't looking closely at how the regex is mutated before being used...