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Here's one lurking in javascript:

/A-z/ includes "[]^_`" [1]

Now go search github [2] and see the +1k repos that have this bug in their parsing of base64

This isn't WTF at all, that's exactly how regexes should work!

In case anyone is wondering why this isn't a WTF - See [1]..

agreed, not my website so i couldnt control the name. Just talking about how A-z includes non(standard) base64 chars

Interesting!

I didn't understand it at first, but the key difference is `A-z` vs. `A-Za-z`.