Finds whether the given variable is numeric. Numeric strings consist of
optional sign, any number of digits, optional decimal part and optional
exponential part. Thus +0123.45e6 is a valid numeric
value. Hexadecimal notation (0xFF) is allowed too but
only without sign, decimal and exponential part.
Parameters
- var
The variable being evaluated.
Return Values
Returns TRUE if var is a number or a numeric
string, FALSE otherwise.
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