private byte getByte(String tok) {
		char c1 = tok.charAt(0);
		char c2 = tok.charAt(1);
		// note: the hexValueOf() method will turn wildcard chars into 0s
		return (byte) (hexValueOf(c1) * 16 + hexValueOf(c2));
	}
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