From 30459d260d69f516bf986ea649abb93a96d719d6 Mon Sep 17 00:00:00 2001
From: Mark Baker <mark@lange.demon.co.uk>
Date: Mon, 18 Nov 2013 08:00:49 +0000
Subject: [PATCH] General: (RomanSyroeshko) GB-265 -
 PHPExcel_Shared_String.IsUTF8 returns FALSE for Cyrillic UTF-8 input

---
 Classes/PHPExcel/Shared/String.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Classes/PHPExcel/Shared/String.php b/Classes/PHPExcel/Shared/String.php
index 3ba1be26..6fe9eb96 100644
--- a/Classes/PHPExcel/Shared/String.php
+++ b/Classes/PHPExcel/Shared/String.php
@@ -403,7 +403,7 @@ class PHPExcel_Shared_String
 	 * @return boolean
 	 */
 	public static function IsUTF8($value = '') {
-		return utf8_encode(utf8_decode($value)) === $value;
+		return $string === '' || preg_match('/^./su', $string) === 1;
 	}
 
 	/**