private boolean isSingleWildCardChar(String token) {
		if (token.length() == 1) {
			char c = token.charAt(0);
			return WILD_CARDS.indexOf(c) >= 0;
		}
		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