jodd-json/src/main/java/jodd/json/JsonParser.java
protected char consumeOneOf(final char c1, final char c2) {
		char c = input[ndx];

		if ((c != c1) && (c != c2)) {
			return 0;
		}

		ndx++;

		return c;
	}
protected char consumeOneOf(final char c1, final char c2) {
		char c = input[ndx];

		if ((c != c1) && (c != c2)) {
			return 0;
		}

		ndx++;

		return c;
	}
Consumes one of the allowed char at current position.
If char is different, return <code>0</code>.
If matched, returns matched char.