src/main/java/com/bazaarvoice/jless/parser/Parser.java
Rule String() {
        return FirstOf(
                Sequence('\'', ZeroOrMore(TestNot('\'' ), ANY), '\'' ),
                Sequence('"', ZeroOrMore(TestNot('"' ), ANY), '"' )
        );
    }
Rule String() {
        return FirstOf(
                Sequence('\'', ZeroOrMore(TestNot('\'' ), ANY), '\'' ),
                Sequence('"', ZeroOrMore(TestNot('"' ), ANY), '"' )
        );
    }
Ex: 'hello' / "hello"