diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 3187e7edca..512accbe9f 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -3206,7 +3206,7 @@ function links_add_target( $content, $target = '_blank', $tags = array('a') ) {
 function _links_add_target( $m ) {
 	global $_links_add_target;
 	$tag = $m[1];
-	$link = preg_replace('|(target=[\'"](.*?)[\'"])|i', '', $m[2]);
+	$link = preg_replace('|(target=([\'"])(.*?)\2)|i', '', $m[2]);
 	return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
 }
 
diff --git a/wp-includes/media.php b/wp-includes/media.php
index 0b28b2b93d..7e7cff4591 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1929,11 +1929,11 @@ function get_content_media( $type, &$content, $html = true, $remove = false, $li
 	$data = array();
 
 	foreach ( $items as $item ) {
-		preg_match_all( '#src=[\'"](.+?)[\'"]#is', $item, $src, PREG_SET_ORDER );
+		preg_match_all( '#src=([\'"])(.+?)\1#is', $item, $src, PREG_SET_ORDER );
 		if ( ! empty( $src ) ) {
 			$srcs = array();
 			foreach ( $src as $s )
-				$srcs[] = $s[1];
+				$srcs[] = $s[2];
 
 			$data[] = array_values( array_unique( $srcs ) );
 		}
@@ -2254,9 +2254,9 @@ function get_content_images( &$content, $html = true, $remove = false, $limit =
 	$srcs = array();
 
 	foreach ( $tags as $tag ) {
-		preg_match( '#src=[\'"](.+?)[\'"]#is', $tag, $src );
-		if ( ! empty( $src[1] ) ) {
-			$srcs[] = $src[1];
+		preg_match( '#src=([\'"])(.+?)\1#is', $tag, $src );
+		if ( ! empty( $src[2] ) ) {
+			$srcs[] = $src[2];
 			if ( $limit > 0 && count( $srcs ) >= $limit )
 				break;
 		}
@@ -2310,10 +2310,10 @@ function get_content_galleries( &$content, $html = true, $remove = false, $limit
 				if ( $html ) {
 					$galleries[] = $gallery;
 				} else {
-					preg_match_all( '#src=[\'"](.+?)[\'"]#is', $gallery, $src, PREG_SET_ORDER );
+					preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
 					if ( ! empty( $src ) ) {
 						foreach ( $src as $s )
-							$srcs[] = $s[1];
+							$srcs[] = $s[2];
 					}
 
 					$data['src'] = array_values( array_unique( $srcs ) );
diff --git a/wp-includes/post-formats.php b/wp-includes/post-formats.php
index 7993b538d6..e5340e66e1 100644
--- a/wp-includes/post-formats.php
+++ b/wp-includes/post-formats.php
@@ -791,8 +791,8 @@ function get_content_url( &$content, $remove = false ) {
 
 		return $trimmed;
 	// the content is HTML so we grab the first href
-	} elseif ( preg_match( '/<a\s[^>]*?href=[\'"](.+?)[\'"]/is', $content, $matches ) ) {
-		return esc_url_raw( $matches[1] );
+	} elseif ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
+		return esc_url_raw( $matches[2] );
 	}
 
 	$lines = explode( "\n", $trimmed );