"""A valid number can be split up into these components (in order):

A decimal number or an integer.
(Optional) An 'e' or 'E', followed by an integer.
A decimal number can be split up into these components (in order):

(Optional) A sign character (either '+' or '-').
One of the following formats:
One or more digits, followed by a dot '.'.
One or more digits, followed by a dot '.', followed by one or more digits.
A dot '.', followed by one or more digits.
An integer can be split up into these components (in order):

(Optional) A sign character (either '+' or '-').
One or more digits.
For 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"].

Given a string s, return true if s is a valid number.

Example 1:
Input: s = "0"
Output: true

Example 2:
Input: s = "e"
Output: false

Example 3:
Input: s = "."
Output: false

Example 4:
Input: s = ".1"
Output: true"""

class Solution:
    def isNumber(self, s: str, t=1, tt=1) -> bool:
        
        pattern = re.compile(r'^[+-]?(\d+|\d+\.\d*|\.\d+)([eE][+-]?\d+)?$')
        return pattern.match(s) is not None

"""Runtime: 28 ms, faster than 95.19% of Python3 online submissions for Valid Number.
Memory Usage: 14.4 MB, less than 30.57% of Python3 online submissions for Valid Number."""