General: Escape periods in regular expressions where the character is intended to match only a literal period.

Props westonruter, mukesh27, johnbillion

Fixes #63988

git-svn-id: https://develop.svn.wordpress.org/trunk@60783 602fd350-edb4-49c9-b593-d223f7449a82

Author: johnbillion

src/wp-includes/admin-bar.php

@@ -377,7 +377,7 @@ function wp_admin_bar_site_menu( $wp_admin_bar ) {
 	$blogname = get_bloginfo( 'name' );
 
 	if ( ! $blogname ) {
-		$blogname = preg_replace( '#^(https?://)?(www.)?#', '', get_home_url() );
+		$blogname = preg_replace( '#^(https?://)?(www\.)?#', '', get_home_url() );
 	}
 
 	if ( is_network_admin() ) {
@@ -698,7 +698,7 @@ function wp_admin_bar_my_sites_menu( $wp_admin_bar ) {
 		$blogname = $blog->blogname;
 
 		if ( ! $blogname ) {
-			$blogname = preg_replace( '#^(https?://)?(www.)?#', '', get_home_url() );
+			$blogname = preg_replace( '#^(https?://)?(www\.)?#', '', get_home_url() );
 		}
 
 		$menu_id = 'blog-' . $blog->userblog_id;

src/wp-includes/embed.php

@@ -202,7 +202,7 @@ function wp_maybe_load_embeds() {
 		return;
 	}
 
-	wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
+	wp_embed_register_handler( 'youtube_embed_url', '#https?://(www\.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
 
 	/**
 	 * Filters the audio embed handler callback.

tests/phpunit/tests/oembed/WpEmbed.php

@@ -100,7 +100,7 @@ public function test_wp_embed_unregister_handler() {
 		$handlers = $GLOBALS['wp_embed']->handlers[10];
 
 		// Restore.
-		wp_embed_register_handler( 'youtube_embed_url', '#https?://(www.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
+		wp_embed_register_handler( 'youtube_embed_url', '#https?://(www\.)?youtube\.com/(?:v|embed)/([^/]+)#i', 'wp_embed_handler_youtube' );
 
 		$this->assertArrayNotHasKey( 'youtube_embed_url', $handlers );
 	}