Regex support seems sketchy (libudev)

[yannickbt64]

Hi,

Using libudev for matching devices in /dev/input, I see the matching using regular expressions doesn't seem to act correctly.

For example:

    struct udev_enumerate *udev_enum = udev_enumerate_new(m_udev);

    udev_enumerate_add_match_subsystem(udev_enum, "input");
    udev_enumerate_add_match_sysname(udev_enum, "event[0-9][0-9]*");
    udev_enumerate_scan_devices(udev_enum);

This code returns no matches despite event0 up to event3 exists.
On standard udev (from systemd), it works fine, under ubuntu 18.04.

But when using buildroot 2018.08 (which uses eudev 3.2.5), this stops working.

Looking at https://linux.die.net/man/8/udev, those should work.

[bbonev]

Can you please confirm if that is still the case with the latest release?