src/main/java/br/com/starcode/parccser/Parser.java
protected StringValue string() throws ParserException {
        Character openQuote = current;
        int initialPosition = pos;
        boolean escape = false;
        next();
        StringBuilder value = new StringBuilder();
        StringBuilder string = new StringBuilder();
        while (!end()) {
            if (escape) {
                //TODO implement UNICODE
                if (current == openQuote || current == '\\') {
                    value.append(current);
                    string.append(current);
                    escape = false;
                } else {
                    throw new ParserException("Invalid escape character at position " + pos);
                }
            } else {
            	if (current == openQuote) break;
                string.append(current);
                if (current == '\\') {
                    escape = true;
                } else {
                    value.append(current);
                }
            }
            next();
        }

        if (current != openQuote) {
            throw new ParserException("String not closed!");
        }
        next();
        return new StringValue(new Context(content, string.toString(), initialPosition, pos), value.toString());

    }
protected StringValue string() throws ParserException {
        Character openQuote = current;
        int initialPosition = pos;
        boolean escape = false;
        next();
        StringBuilder value = new StringBuilder();
        StringBuilder string = new StringBuilder();
        while (!end()) {
            if (escape) {
                //TODO implement UNICODE
                if (current == openQuote || current == '\\') {
                    value.append(current);
                    string.append(current);
                    escape = false;
                } else {
                    throw new ParserException("Invalid escape character at position " + pos);
                }
            } else {
            	if (current == openQuote) break;
                string.append(current);
                if (current == '\\') {
                    escape = true;
                } else {
                    value.append(current);
                }
            }
            next();
        }

        if (current != openQuote) {
            throw new ParserException("String not closed!");
        }
        next();
        return new StringValue(new Context(content, string.toString(), initialPosition, pos), value.toString());

    }
string    {string1}|{string2}
string1   \"([^\n\r\f\\"]|\\{nl}|{nonascii}|{escape})*\"
string2   \'([^\n\r\f\\']|\\{nl}|{nonascii}|{escape})*\'
nonascii  [^\0-\177]
escape    {unicode}|\\[^\n\r\f0-9a-f]
unicode   \\[0-9a-f]{1,6}(\r\n|[ \n\r\t\f])?
nl        \n|\r\n|\r|\f