diff --git a/plugin.php b/plugin.php
index 8d6366d..a67e73d 100644
--- a/plugin.php
+++ b/plugin.php
@@ -1,136 +1,158 @@
-<?php
-/*
-Plugin Name: Better Yourls BlackList Domains
-Plugin URI: https://git.oldgate.org/Sophia/better-yourls-blacklist-domains
-Description: Plugin which disallows blacklisted domains and bans the submitter's IP address. GPL v3
-Version: 0.06
-Author: Sophia Atkinson
-Author URI: https://sophia.wtf
-Original Author: apelly
-Original Author URI: http://len.io
-*/
+    <?php
+    /*
+    Plugin Name: Better Yourls BlackList Domains
+    Plugin URI: https://git.oldgate.org/Sophia/better-yourls-blacklist-domains
+    Description: Plugin which disallows blacklisted domains and bans the submitter's IP address. GPL v3
+    Version: 0.06
+    Author: Sophia Atkinson
+    Author URI: https://sophia.wtf
+    Original Author: apelly
+    Original Author URI: http://len.io
+    */
 
-// No direct access
-if( !defined( 'YOURLS_ABSPATH' ) ) die();
+    // No direct access
+    if( !defined( 'YOURLS_ABSPATH' ) ) die();
 
-// Hook the custom function into the 'shunt_add_new_link' event
-yourls_add_filter( 'shunt_add_new_link', 'better_blacklist_domain_check' );
+    // Hook the custom function into the 'shunt_add_new_link' event
+    yourls_add_filter( 'shunt_add_new_link', 'better_blacklist_domain_check' );
 
-// Hook the admin page into the 'plugins_loaded' event
-yourls_add_action( 'plugins_loaded', 'better_blacklist_add_admin_page' );
+    // Hook the admin page into the 'plugins_loaded' event
+    yourls_add_action( 'plugins_loaded', 'better_blacklist_add_admin_page' );
 
-// Function to check if a domain is blacklisted
-function better_blacklist_domain_check( $shunt, $url ) {
-    // Parse the URL and extract the host
-    $parsed_url = parse_url( $url );
+    // Function to check if a domain is blacklisted
+    function better_blacklist_domain_check( $shunt, $url ) {
+        // Parse the URL and extract the host
+        $parsed_url = parse_url( $url );
 
-    // If parsing fails or host is empty, deny the URL
-    if (empty($parsed_url['host'])) {
-        return blacklist_fail_response();
-    }
+        // If parsing fails or host is empty, deny the URL
+        if (empty($parsed_url['host'])) {
+            return blacklist_fail_response();
+        }
 
-    $domain = $parsed_url['host'];
+        $domain = $parsed_url['host'];
 
-    // Block if using blacklisted protocols
-    if ( isset($parsed_url['scheme']) && in_array( $parsed_url['scheme'], ['http', 'https'], true ) ) {
-        // Instead of blocking here, we return the original shunt
-        // to avoid blocking all URLs with blacklisted protocols
-    }
+        // Block if using blacklisted protocols
+        if ( isset($parsed_url['scheme']) && in_array( $parsed_url['scheme'], ['http', 'https'], true ) ) {
+            // Instead of blocking here, we return the original shunt
+            // to avoid blocking all URLs with blacklisted protocols
+        }
 
-    // Retrieve blacklisted domains from options
-    $blacklisted_domains = yourls_get_option( 'better_blacklist_domain_list' );
-    
-    // If there's a blacklist, check the domain
-    if ( $blacklisted_domains ) {
-        $blacklisted_domains = unserialize( $blacklisted_domains );
+        // Retrieve blacklisted domains from options
+        $blacklisted_domains = yourls_get_option( 'better_blacklist_domain_list' );
+        
+        // If there's a blacklist, check the domain
+        if ( $blacklisted_domains ) {
+            $blacklisted_domains = unserialize( $blacklisted_domains );
 
-        foreach ( $blacklisted_domains as $blacklisted_domain ) {
-            // Check if the entry starts with '/', then consider regex handling
-            if (strpos($blacklisted_domain, '/') === 0) {
-                if (@preg_match($blacklisted_domain, $domain)) {
-                    return blacklist_fail_response();
-                }
-            } else {
-                // Otherwise treat as plain domain (old behavior)
-                $pattern = '/(?:^|\.)' . preg_quote( $blacklisted_domain, '/' ) . '$/i';
-                if ( preg_match( $pattern, $domain ) ) {
-                    return blacklist_fail_response();
+            foreach ( $blacklisted_domains as $blacklisted_domain ) {
+                // Check if the entry starts with '/', then consider regex handling
+                if (strpos($blacklisted_domain, '/') === 0) {
+                    if (@preg_match($blacklisted_domain, $domain)) {
+                        return blacklist_fail_response();
+                    }
+                } else {
+                    // Otherwise treat as plain domain (old behavior)
+                    $pattern = '/(?:^|\.)' . preg_quote( $blacklisted_domain, '/' ) . '$/i';
+                    if ( preg_match( $pattern, $domain ) ) {
+                        return blacklist_fail_response();
+                    }
                 }
             }
         }
+
+        // No match, allow the URL
+        return $shunt;
     }
 
-    // No match, allow the URL
-    return $shunt;
-}
-
-// Return failure response for blacklisted URLs
-function blacklist_fail_response() {
-    return array(
-        'status'  => 'fail',
-        'code'    => 'error:url',
-        'message' => 'This domain is blacklisted',
-        'errorCode' => '403',
-    );
-}
-
-// Add admin page to handle blacklist management
-function better_blacklist_add_admin_page() {
-    yourls_register_plugin_page( 'better_blacklist_domain', 'Blacklist Domains', 'better_blacklist_admin_page' );
-}
-
-// Display the blacklist admin page
-function better_blacklist_admin_page() {
-    if ( $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'blacklist_domain' ) {
-        better_blacklist_process_form();
-    } else {
-        better_blacklist_display_form();
-    }
-}
-
-// Display the form to update the blacklist
-function better_blacklist_display_form() {
-    $nonce = yourls_create_nonce( 'blacklist_domain' );
-    $blacklist_domains = yourls_get_option( 'better_blacklist_domain_list', 'Enter domain addresses here, one per line' );
-
-    if ( $blacklist_domains !== 'Enter domain addresses here, one per line' ) {
-        $blacklist_domains = implode( "\r\n", unserialize( $blacklist_domains ) );
+    // Return failure response for blacklisted URLs
+    function blacklist_fail_response() {
+        return array(
+            'status'  => 'fail',
+            'code'    => 'error:url',
+            'message' => 'This domain is blacklisted',
+            'errorCode' => '403',
+        );
     }
 
-    echo <<<HTML
-    <h2>Blacklist Domains</h2>
-    <form method="post">
-        <input type="hidden" name="action" value="blacklist_domain" />
-        <input type="hidden" name="nonce" value="$nonce" />
-        <p>Enter domains to blacklist (one per line):</p>
-        <textarea class="blacklist-domains" cols="60" rows="15" name="blacklist_form">$blacklist_domains</textarea>
-        <p><input type="submit" value="Save" /></p>
-    </form>
-HTML;
-}
+    // Add admin page to handle blacklist management
+    function better_blacklist_add_admin_page() {
+        yourls_register_plugin_page( 'better_blacklist_domain', 'Blacklist Domains', 'better_blacklist_admin_page' );
+    }
 
-// Process the blacklist form submission
-function better_blacklist_process_form() {
-    // Verify nonce for security
-    yourls_verify_nonce( 'blacklist_domain' );
-
-    // Sanitize and process the form input
-    $blacklist_form = array_filter( array_map( 'trim', explode( "\r\n", $_POST['blacklist_form'] ) ) );
-
-    // Alphabetize the blacklist
-    sort($blacklist_form, SORT_STRING | SORT_FLAG_CASE);
-
-    // Update the option with serialized data
-    yourls_update_option( 'better_blacklist_domain_list', serialize( $blacklist_form ) );
-
-    echo "<p>Blacklist updated!</p>";
-    if ( empty( $blacklist_form ) ) {
-        echo "<p>The blacklist is currently empty.</p>";
-    } else {
-        echo "<p>Current blacklisted domains:</p><ul>";
-        foreach ( $blacklist_form as $domain ) {
-            echo "<li>" . htmlspecialchars($domain, ENT_QUOTES) . "</li>";
+    // Display the blacklist admin page
+    function better_blacklist_admin_page() {
+        if ( $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'blacklist_domain' ) {
+            better_blacklist_process_form();
+        } else {
+            better_blacklist_display_form();
+        }
+    }
+
+    // Display the form to update the blacklist
+    function better_blacklist_display_form() {
+        $nonce = yourls_create_nonce( 'blacklist_domain' );
+        $blacklist_domains = yourls_get_option( 'better_blacklist_domain_list', 'Enter domain addresses here, one per line' );
+
+        if ( $blacklist_domains !== 'Enter domain addresses here, one per line' ) {
+            $blacklist_domains = implode( "\r\n", unserialize( $blacklist_domains ) );
+        }
+
+        echo <<<HTML
+        <h2>Blacklist Domains</h2>
+        <form method="post">
+            <input type="hidden" name="action" value="blacklist_domain" />
+            <input type="hidden" name="nonce" value="$nonce" />
+            <p>Enter domains to blacklist (one per line):</p>
+
+            <details>
+                <summary>Advanced Usage (Regex)</summary>
+                <div>
+                    <p>
+                        You can use regular expressions (Regex) to define more complex patterns for blacklisting domains.<br> 
+                        To use Regex, enter your pattern between slashes (/).<br>
+                        
+                        For example, to block all subdomains of example.com, you could enter <code>/\.example\.com$/i</code>.<br>
+                        The <kbd>i</kbd> flag at the end makes the match case-insensitive. Usually you want to use this flag.
+                    </p>
+
+                    <p>
+                        <b>Further examples:</b><br>
+                        <code>/.*\.xxx$/i</code> - Blocks all domains ending with .xxx<br>
+                        <br>
+
+                        Be cautious when using Regex, as incorrect patterns can lead to unintended blocking of domains.<br>
+                        Always test your Regex patterns to ensure they work as expected.
+                    </p>
+                </div>
+            </details><br>
+            <textarea class="blacklist-domains" cols="60" rows="15" name="blacklist_form" placeholder="Example: block.example.com">$blacklist_domains</textarea>
+            <p><input type="submit" value="Save" /></p>
+        </form>
+    HTML;
+    }
+
+    // Process the blacklist form submission
+    function better_blacklist_process_form() {
+        // Verify nonce for security
+        yourls_verify_nonce( 'blacklist_domain' );
+
+        // Sanitize and process the form input
+        $blacklist_form = array_filter( array_map( 'trim', explode( "\r\n", $_POST['blacklist_form'] ) ) );
+
+        // Alphabetize the blacklist
+        sort($blacklist_form, SORT_STRING | SORT_FLAG_CASE);
+
+        // Update the option with serialized data
+        yourls_update_option( 'better_blacklist_domain_list', serialize( $blacklist_form ) );
+
+        echo "<p>Blacklist updated!</p>";
+        if ( empty( $blacklist_form ) ) {
+            echo "<p>The blacklist is currently empty.</p>";
+        } else {
+            echo "<p>Current blacklisted domains:</p><ul>";
+            foreach ( $blacklist_form as $domain ) {
+                echo "<li>" . htmlspecialchars($domain, ENT_QUOTES) . "</li>";
+            }
+            echo "</ul>";
         }
-        echo "</ul>";
     }
-}