ISNUMBER
b = ISNUMBER (x)
Returns true if x is a number or can be converted to a number.
Example
print ISNUMBER(12) ' Output 1
print ISNUMBER("12") ' Output 1
print ISNUMBER("12E+2") ' Output 1
print ISNUMBER("abc") ' Output 0
print ISNUMBER("1+2") ' Output 0
print ISNUMBER("int(2.4)") ' Output 0
Code samples using ISNUMBER