not correct prcocedure

[anonymous]

;Exemple 1 (Need return "ds")
$q='32432ds2345670z45'
$i =StringLen($q)
Do
$i -= 1
Until IsNumber(StringMid($q,$i,1)) = StringMid($q,$i,1) And isNumber(StringMid($q,$i+1,1)) = StringMid($q,$i+1,1)
MsgBox(0,"",StringMid($q,$i,1)& StringMid($q,$i+1,1))

;Exemple 2 
$q='02dfgds2345670z45'
MsgBox(0,'its String!',IsString(StringMid($q,2,1)));(Need return "0" )
MsgBox(0,'its Number!',IsNumber(StringMid($q,2,1)));(Need return "1")

[Valik]

You miss the point of what IsString() and IsNumber() do. Re-read the documentation closer. In addition things like this should be posted on the support forum.