I am not able to write a proper regex for JavaScript

Question

$scope.myCode=function(dynamicField){
    console.log("exchangeRate Validator Called");

    var regex=new RegExp("^[0-9]*\.?[0-9]{0,6}$");

    var regexCornerCase=new RegExp("^[0-9]+\.$"); //if this matches, 
    //then input has an isuue

    if(isNaN(dynamicField.value)){
        alert("This value accepts only numbers1");
        dynamicField.value=null;
        return;
    }else{
        console.log(regex);
        if(regex.test(dynamicField.value)){

            if(regexCornerCase.test(dynamicField.value))
            {
                console.log(regexCornerCase);
                alert(dynamicField.value);
                alert("This field accepts only numbers2");
                dynamicField.value=null;
                return;
            }
        }
        else{
            alert("This field accepts only numbers");
            dynamicField.value=null;
        }
    }
};

My Use case:

1. the required dynamicField.value should not be like '11111.' or '.'.
2. My current regex: ^[0-9]+\.$ does not seem to work well for this.
3. The online regex engines were matching this correctly, but in javascript it didn't.