match the string 0 0 1 0 1 2 0 1 2 3

\$?\d+(?:\.\d+)?

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alphabetic small and capital numeric 0-9 may contain underscore must be at least 3 characters cannot be longer than 30 characters

Number must start from + and end with a number. Number can be 7 to 15 digit long including + sign in length. Starting with + and leading 0 is not allowed.