regex - Javascript simple regexp doesn't work

Question

I have this code, it looks alright and is really basic, but i can't make it work:

function checkValid(elem){

 var abc = elem.value;

 var re = "/[0-9]/";

 var match = re.test(abc);

 alert(match);
}

It matches 0 and 9, but not 1 to 8, what's wrong here? Thanks.

Answer 1

re is a string, not a RegExp object.

You need to use a regex literal instead of a string literal, like this:

var re = /[0-9]/;

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Also, this will return true for any string that contains a number anywhere in the string.
You probably want to change it to

var re = /^[0-9]+$/;