Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php (revision 19727)
+++ wp-includes/link-template.php (working copy)
@@ -1565,7 +1565,7 @@
if ( !is_single() && $paged > 1 ) {
$attr = apply_filters( 'previous_posts_link_attributes', '' );
- return '". preg_replace( '/&([^#])(?![a-z]{1,8};)/', '&$1', $label ) .'';
+ return '". preg_replace( '/&([^#])(?![a-z]{1,8};)/i', '&$1', $label ) .'';
}
}