https://itch.io/t/292969/bug-0519a-regex-for-variables-broken
You can use the modpanel.gd i linked to on pastebin from there if you want to use 0.5.19a, would need to replace it in both files and backup folders, otherwise changes will be lost after applying, making next apply also break. Hopefully fix is put into a 0.5.19b soon.