PHP：将URL转换为正则表达式以匹配特定域

I want to convert a URL to regular expression to match it with current URL. For example, I have a URL http://www.example.com/example.php I want it to convert to ^(https?://)?(www\.)?example\.com\/example\.php/?(\?.)?(#.)?$

So that I store it and whenever a user hits this url with any number of parameters attached to it, I will match that url with my regular expression and will perform some action based on the results.

I have found many questions but they all are either to match general URL (with any domain name) or with regular expressions given. But I want a function to which I will pass URL and it will return its regular expression and I will use it to match that specific domain.

I have finally created this code with the help of stackoverflow and other communities. This provides me the exact string I require against given URL.

<?php 
    function createrRegex($url) {
        $var1 = '^(https?://)?';
        $host = parse_url($url, PHP_URL_HOST);
        $host_parts = explode('.', $host);
        if (!empty($host_parts)) {
            $length = count($host_parts);
            foreach ($host_parts as $i => $part) {
                if ($i == 0) {
                    if ($part == "www") {
                        $var1 .= '(' . $part . '\\\\.)?';
                    } else {
                        $var1 .= '' . $part;
                        $var1 .= ($i < ($length - 1)) ? '\\\\.' : '';
                    }
                } else {
                    $var1 .= '' . $part;
                    $var1 .= ($i < ($length - 1)) ? '\\\\.' : '';
                }
            }
        }
        $path = '';
        if ((parse_url($url, PHP_URL_PATH) != NULL)) {
            $path = str_replace('/', '\\\\/', parse_url($url, PHP_URL_PATH));
            $path = str_replace('.', '\\\\.', $path);
        }
        $var1 .= $path;
        $var1 .= '/?(\\\\?.*)?(#.*)?$';
        return $var1;
    }
?>