From 55656b0c7d87e079a105604fe79fe5e382723f2f Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Thu, 17 Sep 2015 21:40:06 +0100
Subject: [PATCH] MDL-51375 excel output: more work to avoid invalid sheet
 names

---
 lib/excellib.class.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/excellib.class.php b/lib/excellib.class.php
index b2731b2626b..b75f173a06e 100644
--- a/lib/excellib.class.php
+++ b/lib/excellib.class.php
@@ -160,7 +160,7 @@ class MoodleExcelWorksheet {
      */
     public function __construct($name, PHPExcel $workbook) {
         // Replace any characters in the name that Excel cannot cope with.
-        $name = strtr($name, '[]*/\?:', '       ');
+        $name = strtr(trim($name, "'"), '[]*/\?:', '       ');
         // Shorten the title if necessary.
         $name = core_text::substr($name, 0, 31);