Merge pull request #1092 from webbuilders-group/fix-templates-regex-windows

BUGFIX: Fixed issue causing the regex on windows to throw an error

code/Model/Recipient/EmailRecipient.php

@@ -542,7 +542,7 @@ class EmailRecipient extends DataObject
             $templatePath = substr($absoluteFilename, strlen($prefixToStrip) + 1);
 
             // Optionally remove "templates/" ("templates\" on Windows respectively) prefixes
-            if (preg_match('#(?<=templates' . DIRECTORY_SEPARATOR . ').*$#', $templatePath, $matches)) {
+            if (preg_match('#(?<=templates' . preg_quote(DIRECTORY_SEPARATOR, '#') . ').*$#', $templatePath, $matches)) {
                 $templatePath = $matches[0];
             }