정규표현식으로 표현하는 부동소수점 매칭 패턴
https://medium.com/@su_bak/%E1%84%8C%E1%85%A5%E1%86%BC%E1%84%80%E1%85%B2%E1%84%91%E1%85%AD%E1%84%92%E1%85%A7%E1%86%AB%E1%84%89%E1%85%B5%E1%86%A8%E1%84%8B%E1%85%B3%E1%84%85%E1%85%A9-%E1%84%91%E1%85%AD%E1%84%92%E1%85%A7%E1%86%AB%E1%84%92%E1%85%A1%E1%84%82%E1%85%B3%E1%86%AB-%E1%84%87%E1%85%AE%E1%84%83%E1%85%A9%E1%86%BC%E1%84%89%E1%85%A9%E1%84%89%E1%85%AE%E1%84%8C%E1%85%A5%E1%86%B7-%E1%84%86%E1%85%A2%E1%84%8E%E1%85%B5%E1%86%BC-%E1%84%91%E1%85%A2%E1%84%90%E1%85%A5%E1%86%AB-bfc39441b408