gnumber(string [, char [, base] ]);
GNUMBER extracts an unsigned integer from the given string, starting at character position "char". The number may be made to be taken in any base less than 11. "Char" defaults to zero (ie, the start of the string), and "base" defaults to 10. If a non-numeric character appears in the string after "char", GNUMBER will return the number collected to that point. If the starting character is non-numeric, GNUMBER returns -1.
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