The ISDIGIT function will check that the expression consists of entirely numeric characters. It takes the general form:
The expression can return a result of any type. The ISDIGIT() function will return TRUE (1) if the expression consists of entirely numeric characters. The function will return FALSE (0) if the expression contains any characters, which are not numeric.
When the ISDIGIT() function is used in International Mode the properties of each character is determined according to the Unicode Standard.
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