String pattern = "^'.'";
        Pattern r = Pattern.compile(pattern);
        Matcher m = r.matcher(code);
        String s = code;
        try {
            if (m != null && m.find()) {
                code = code.substring(m.group(0).length());
                allLexemes.add(new Lexeme(m.group(0), LexemeTypes.Types.ConstantSymbol));
            } else {
                String currToken = Pattern.compile("\s").matcher(code).group(0);
                code = code.substring(currToken.length());
                allLexemes.add(new Lexeme(code, LexemeTypes.Types.ERROR));
            }
        }catch (IllegalStateException ex){
            String currToken = Pattern.compile("\s").matcher(code).group(0);
            code = code.substring(currToken.length());
            allLexemes.add(new Lexeme(code, LexemeTypes.Types.ERROR));
        }