javascript regex validate url

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javascript regex validate url
2 Answer(s) a year and a month ago
Posted in : JavaScript Questions

How to validate URL in regex Javascript

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May 11, 2012 at 10:53 AM

<html>
<head>
<title>Url validation using regex</title>
<script type="text/javascript">
    function validate() {
        var url = document.getElementById("url").value;
        var pattern = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
        if (pattern.test(url)) {
            alert("Url is valid");
            return true;
        } 
            alert("Url is not valid!");
            return false;

    }
</script>

</head>
<body>
<h2>Validating Url..</h2>
Url :
<input type="text" name="url" id="url" />
<input type="submit" value="Check" onclick="validate();" />
</body>
</html>

May 12, 2012 at 1:22 PM

url pattern is like HYPERLINK

"http://www.roseindia.net/hibernate/examples/criteria"

http://www.roseindia.net/hibernate/examples/criteria

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

/../(forward slashes) is used to quote your regular expression.

() is used to group the content.

| is used for or condition

\/ backslash consider / as a literal .

\w+ for one or more alphanumeric value.

{0,1} shows the range of content having length between 0 to 1.

* matches the preceding character zero or more time.

[..] matches any letter enclosed with in.

+ shows that preceding character come 1 or more times.

. Shows that \ will treat . as a literal.

$ is used for ending the string.

test() method takes one argument and check that to the pattern.

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