[LeetCode] Valid Number

65. Valid Number 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 sp...

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