Given a string s, return whether s is a valid number.
\n
\nFor example, all the following are valid numbers: "2", "0089", "-0.1", "+3.14", "4.", "-.9", "2e10", "-90E3", "3e+7", "+6e-1", "53.5e93", "-123.456e789", while the following are not valid numbers: "abc", "1a", "1e", "e3", "99e2.5", "--6", "-+3", "95a54e53".
Formally, a valid number is defined using one of the following definitions:
\n\nAn integer number is defined with an optional sign '-' or '+' followed by digits.
A decimal number is defined with an optional sign '-' or '+' followed by one of the following definitions:
'.'.'.' followed by digits.'.' followed by digits.An exponent is defined with an exponent notation 'e' or 'E' followed by an integer number.
The digits are defined as one or more digits.
\n\n\n
Example 1:
\n\nInput: s = "0"
\n\nOutput: true
\nExample 2:
\n\nInput: s = "e"
\n\nOutput: false
\nExample 3:
\n\nInput: s = "."
\n\nOutput: false
\n\n
Constraints:
\n\n1 <= s.length <= 20s consists of only English letters (both uppercase and lowercase), digits (0-9), plus '+', minus '-', or dot '.'.给定一个字符串 s ，返回 s 是否是一个 有效数字。
例如，下面的都是有效数字：\"2\", \"0089\", \"-0.1\", \"+3.14\", \"4.\", \"-.9\", \"2e10\", \"-90E3\", \"3e+7\", \"+6e-1\", \"53.5e93\", \"-123.456e789\"，而接下来的不是：\"abc\", \"1a\", \"1e\", \"e3\", \"99e2.5\", \"--6\", \"-+3\", \"95a54e53\"。
一般的，一个 有效数字 可以用以下的规则之一定义：
\n\n一个 整数 定义为一个 可选符号 '-' 或 '+' 后面跟着 数字。
一个 十进制数 定义为一个 可选符号 '-' 或 '+' 后面跟着下述规则：
.。. 再跟着 数位。. 后跟着 数位。指数 定义为指数符号 'e' 或 'E'，后面跟着一个 整数。
数字 定义为一个或多个数位。
\n\n\n\n
示例 1：
\n\n输入：s = \"0\"
\n\n输出：true
\n示例 2：
\n\n输入：s = \"e\"
\n\n输出：false
\n示例 3：
\n\n输入：s = \".\"
\n\n输出：false
\n\n\n
提示：
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"exampleTestcases": "\"0\"\n\"e\"\n\".\"",
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