javascript url validation help [closed]

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If user enters a URL, as soon as they have completed the URL and hit enter the URL will appear below the text box and the text box will be emptied again.

It will only do this if it is a validly formed URL. For example if someone writes blahbla.243, this will not do anything as it is not a valid URL.

It will, however, accept any variations that are valid such as http://www.url.com or www.url.co.uk and url.com.au.

And it will remove anything after the end of the country code for example if the person types www.abc.net/dlkjfk then only www.abc.net will be accepted.

Thank you!

---

This may not be as strict as you're looking for, but it's what I use and its decent

var reg = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;

if(reg.test(elem[i].value) == false) {

//not cool story

}else{

//good link

}