From ce4379973fa3c8efb2e825c1910c4a32d8761579 Mon Sep 17 00:00:00 2001
From: Arnaud Trouve <ak4t0sh@free.fr>
Date: Tue, 14 Mar 2017 19:07:09 +0100
Subject: [PATCH] MDL-58257 course: fix search containing a hyphen

In case a hyphen (-) was preceded and followed by spaces,
the pattern for the "not regex" was empty causing an empty response from the database.
---
 lib/datalib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/datalib.php b/lib/datalib.php
index 96a940cf683..df48d6d8500 100644
--- a/lib/datalib.php
+++ b/lib/datalib.php
@@ -787,7 +787,7 @@ function get_courses_search($searchterms, $sort, $page, $recordsperpage, &$total
             $searchcond[] = "$concat $REGEXP :ss$i";
             $params['ss'.$i] = "(^|[^a-zA-Z0-9])$searchterm([^a-zA-Z0-9]|$)";
 
-        } else if (substr($searchterm,0,1) == "-") {
+        } else if ((substr($searchterm,0,1) == "-") && (core_text::strlen($searchterm) > 1)) {
             $searchterm = trim($searchterm, '+-');
             $searchterm = preg_quote($searchterm, '|');
             $searchcond[] = "$concat $NOTREGEXP :ss$i";