Method fixOctal

MathParser/src/com/aghajari/math/MathParser.java:332–341

(0o027) -> (23)

(String src)

     * (0o027) -> (23)
     */
    private String fixOctal(String src) {
        Matcher matcher = Utils.octal.matcher(src);
        if (matcher.find()) {
            String a = matcher.group(0);
            long value = Long.parseLong(a.substring(3, a.length() - 1), 8);
            src = src.substring(0, matcher.start() + 1) + value + src.substring(matcher.end() - 1);
            return fixOctal(src);
        }
        return src;
    }

    /**
     * Adds default constants {pi, e}