表示数值的字符串

import java.util.regex.Pattern;
 public class Solution {
        public static boolean isNumeric(char[] str) {
            String pattern = "^[-+]?\\d*(?:\\.\\d*)?(?:[eE][+\\-]?\\d+)?$";
            String s = new String(str);
            return Pattern.matches(pattern,s);
        }
    }