private boolean hasInvalidChars(List<String> byteGroups) {
		for (String byteGroup : byteGroups) {
			if (hasInvalidChars(byteGroup)) {
				return true;
			}
		}
		return false;
	}
Returns the byte value to be used for the given hex bytes.  Handles wildcard characters by
return treating them as 0s.
Ghidra/Features/Base/src/main/java/ghidra/features/base/memsearch/format/HexSearchFormat.java