David Ellsworth

PCRE2 can use fixed-length backreferences inside lookbehinds, but regex101 doesn't allow it

3

## Bug Description PCRE2 supports using backreferences inside lookbehinds as long as it can detect that they are fixed-length. For example, `(.)(?

Python flavor doesn't reject nested backreferences, which Python itself does

2

## Bug Description Python doesn't support nested backreferences. For example, `/^(^x|\1xx)*$/` cannot be used to match strings of `x` with the length of a perfect square, because it references `\1`...

I'd really like to switch from NTFS to btrfs while still continuing to use Windows as my primary OS for a while longer, but there is one main problem standing...