Doesn't work:
"quartz_from_quartzBlock"
"quartzBlock"
"L"
Works:
"quartz_from_quartzblock"
"quartzblock"
"l"
Sanitizing filename data shouldn't be too hard. Try not to enforce coding practices on your average user.
MC-134422
camelCase / capital letters not allowed in crafting recipe filenames
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Duplicate
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Parenthesis not allowed either, so I'm assuming nothing but lowercase letters, numbers, and underscores are allowed.