Not working on different grub2 entry

[leancode]

I have an entry that looks like the below that will not match the regex in grub2_kernel_entries.
I've tried to improve it but after a couple of hours I had to conceed defeat. I see that there are several issues that all boil down to the same thing. Do you think you could find the time to updated it? The truth is this script is worth its time in gold.
menuentry 'Proxmox Virtual Environment GNU/Linux' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-2310887e430f1051' {
load_video
insmod gzio
if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod part_gpt
insmod zfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 --hint-bios=hd1,gpt2 --hint-efi=hd1,gpt2 --hint-baremetal=ahci1,gpt2 --hint-bios=hd2,gpt2 --hint-efi=hd2,gpt2 --hint-baremetal=ahci2,gpt2 --hint-bios=hd3,gpt2 --hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2 --hint-bios=hd4,gpt2 --hint-efi=hd4,gpt2 --hint-baremetal=ahci4,gpt2 --hint-bios=hd5,gpt2 --hint-efi=hd5,gpt2 --hint-baremetal=ahci5,gpt2 --hint-bios=hd6,gpt2 --hint-efi=hd6,gpt2 --hint-baremetal=ahci6,gpt2 --hint-bios=hd7,gpt2 --hint-efi=hd7,gpt2 --hint-baremetal=ahci7,gpt2 2310887e430f1051
else
search --no-floppy --fs-uuid --set=root 2310887e430f1051
fi
echo 'Loading Linux 5.3.13-3-pve ...'
linux /ROOT/pve-1@/boot/vmlinuz-5.3.13-3-pve root=ZFS=rpool/ROOT/pve-1 ro root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet
echo 'Loading initial ramdisk ...'
initrd /ROOT/pve-1@/boot/initrd.img-5.3.13-3-pve
}