@Override
	public String normalizeValue(String value) {
		if (value.length() == 34 && value.charAt(0) == '0' && value.charAt(1) == 'x') {
			value = value.substring(2, 34);
		}
		if (value.length() != 32 || !value.matches(Md5BSimFilterType.md5Regex)) {
			return null;
		}
		value = value.toLowerCase();
		return value;
	}
A BsimFilterType for filtering on functions whose containing program don't match a specific md5.
Ghidra/Features/BSim/src/main/java/ghidra/features/bsim/gui/filters/NotMd5BSimFilterType.java