How To Validate URL with Regular expression

This is very lazy tut, but for beginner is good tut. We are doing each time URL validation for websites. This is very common functionality for any website as well as for developer.
Here we are providing simple Reg expression to validate URL.

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$reg_exp = "/^(http(s?):\/\/)?(www\.)+[a-zA-Z0-9\.\-\_]+(\.[a-zA-Z]{2,3})+(\/[a-zA-Z0-9\_\-\s\.\/\?\%\#\&\=]*)?$/";
            if(preg_match($reg_exp, 'url') == False){
            $errors[] = 'URL is not valid.';
            }
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Hi, This is Parvez Alam from India. I am software developer with 4 years’ experience in web development. I have submitted articles on PHP, Mysql, Magento,CSS, HTML, jQuery, web designing and social API. You can subscribe to my blog via RSS/Twitter/Google plus and Facebook. parvez1487(at)gmail(dot)com

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