Hi,

I'm working with regex, and I isolated an unexpected behaviour.

If I paste attached code code in scratch buffer and evaluate it, emacs hangs (cpu stays at 100% until I kill emacs)

Im running emacs for windows x64, in particular this package:

https://sourceforge.net/projects/emacsbinw64/files/release/emacs-w64-25.3-O2-with-modules.7z/download

The variable case-fold-search is set to t.

Can you help me?

Thank you very much,

Michele Pes