url validation jquery using regex

Question

I want to validate URLs of the following form:

1. http://www.example.com
2. http://example.com
3. www.example.com

function is_valid_url(url) {
    return /^http(s)?:\/\/(www\.)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/.test(url);
}

1 and 2 are validated correctly. But 3 shows an invalid URL.

Answer 1

That's the correct regular expression for your use case:

function is_valid_url(url) {
    return /^(http(s)?:\/\/)?(www\.)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/.test(url);
}

If "http://" is optional, you will have to put it in brackets and add a question mark.

Answer 2

Try this, It worked for me.

var url = $("#<%= txtUrl.ClientID %>").val();
var pattern = /^(http|https)?:\/\/[a-zA-Z0-9-\.]+\.[a-z]{2,4}/;

args.IsValid = pattern.test(url);

http://www.tricksofit.com/2013/12/regular-expression-with-jquery-validation#highlighter_290011