How to check if filed has Arabic characters through Siebel eScript

Below is simple function for checking if ipstring have Arabic Characters in it:

function hasArabic(ipstring)
{
    var araChar = 'ئءؤرلاىةوزظطكمنتالبيسشضصثقفغعهخحجد~ْلآآـألأًٌٍَُِلإإ';
    var strlen = ipstring.length; // test string length
 
    if (strlen < 1)
    {
        return false;
    }

    for (var i = 0; i < ipstring.length; i++)
    {     
        if (araChar.indexOf(ipstring[i]) >= 0) // found
        {
            return true;
        }
    }
 
    return false;
}