javascript regex validation if no content

Question

I have the following validation on a form field:

$(".controlsphone input").blur(function() {
    var ree = /^\d+$/;
    if(ree.test(document.getElementById("register_telephone").value))
        {
            $(this).css('border-color','green');
            $(this).siblings('.info').css('display','none');
            $(this).siblings('.error').css('display','none');
            $(this).siblings('.valid').css('display','inline-block');   
            $("#email_error401112").hide();
            $('#registerErrors').hide();
    }
    else
    {
        $('#registerErrors').show();
        $('#email_error401112').remove();
        $('#registerErrors').append('<p id="email_error401112">Please enter a phone number</p>');
    }
});

I would like to only validate the field if a number exists. The field is not required, but if there is content within the field, it needs to be valid (a number)

How does the above code look? Any ideas what i can do to implement this?

Cheers, Dan

You could also use the pattern attribute of input, if your target browsers support html5 patterns: developer.mozilla.org/en-US/docs/HTML/Forms_in_HTML — beatgammit
– beatgammit, Commented May 16, 2013 at 13:57

luiges90 · Accepted Answer · 2013-05-16 13:49:59Z

3

Use

var ree = /^\d*$/;

because + stands for one or more, excluding zero.

while * stands for zero or more

answered May 16, 2013 at 13:49

luiges90

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