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Validate URL's with JavaScript and Regex

Very handy to validate input on the client in the browser using JavaScript and Regular expressions

See the working demo below.

Demo: How to Validate URL's with JavaScript and Regex

JavaScript

This is pretty much the standard JavaScript you'll paste into your page script block - or in a .js file if you prefer.

            
            function isURL(elm) {
              if (elm.value == '') {
                    alert("fill in email"); return false;
                }
                if (elm.value.indexOf(" ") != -1) {
                    alert("Spaces are not allowed in a URL");
                    return false;
                } if (elm.value.match(/(((file|gopher|news|nntp|telnet|http|ftp|https|ftps|sftp):\/\/)|(www\.))+(([a-zA-Z0-9\._-]+\.[a-zA-Z]{2,6})|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(\/[a-zA-Z0-9\&%_\.\/-~-]*)?/)) {
                    alert("VALID URL");
                   return true;
                } else {
                    alert("The URL seems incorrect!!! ");
                    return false;
                }
            }
        
    

CSS

Edit as necessary.

           
            body{
  font-size:2em;
  font-weight:bold;
}
input{
  font-size:50px;
}
button{
  font-size:50px;
}
        
    

Conclusion

A few lines of JQuery is all you need to validate url's with javascript and regex