Index: wp-admin/includes/misc.php
===================================================================
--- wp-admin/includes/misc.php	(revision 26820)
+++ wp-admin/includes/misc.php	(working copy)
@@ -71,11 +71,11 @@
 	{
 		$state = false;
 		foreach ( $markerdata as $markerline ) {
-			if (strpos($markerline, '# END ' . $marker) !== false)
+			if ( "# END {$marker}" === $markerline )
 				$state = false;
 			if ( $state )
 				$result[] = $markerline;
-			if (strpos($markerline, '# BEGIN ' . $marker) !== false)
+			if ( "# BEGIN {$marker}" === $markerline )
 				$state = true;
 		}
 	}
@@ -112,7 +112,7 @@
 		if ( $markerdata ) {
 			$state = true;
 			foreach ( $markerdata as $n => $markerline ) {
-				if (strpos($markerline, '# BEGIN ' . $marker) !== false)
+				if ( "# BEGIN {$marker}" === $markerline )
 					$state = false;
 				if ( $state ) {
 					if ( $n + 1 < count( $markerdata ) )
@@ -120,7 +120,7 @@
 					else
 						fwrite( $f, "{$markerline}" );
 				}
-				if (strpos($markerline, '# END ' . $marker) !== false) {
+				if ( "# END {$marker}" === $markerline ) {
 					fwrite( $f, "# BEGIN {$marker}\n" );
 					if ( is_array( $insertion ))
 						foreach ( $insertion as $insertline )