diff --git a/admin/tool/httpsreplace/classes/url_finder.php b/admin/tool/httpsreplace/classes/url_finder.php
index 619e46898bf..734c4e1a1ea 100644
--- a/admin/tool/httpsreplace/classes/url_finder.php
+++ b/admin/tool/httpsreplace/classes/url_finder.php
@@ -92,7 +92,14 @@ class url_finder {
 
         require_once($CFG->libdir.'/filelib.php');
 
-        $httpurls  = "(src|data)\ *=\ *[\\\"\']http://";
+        if ($DB->sql_regex_supported()) {
+            $regexp = $DB->sql_regex();
+            $httpurls  = "(src|data)\ *=\ *[\\\"\']http://";
+        } else {
+            // Simpler query for DBs without regex support.
+            $regexp = "like";
+            $httpurls  = "%=%http://%";
+        }
 
         // TODO: block_instances have HTML content as base64, need to decode then
         // search, currently just skipped. See MDL-60024.
@@ -127,6 +134,8 @@ class url_finder {
             'mediumtext',
             'longtext',
             'varchar',
+            'nvarchar',
+            'CLOB',
         );
 
         $numberoftables = count($tables);
@@ -140,7 +149,6 @@ class url_finder {
                 continue;
             }
             if ($columns = $DB->get_columns($table)) {
-                $regexp = $DB->sql_regex();
                 foreach ($columns as $column) {
 
                     if (in_array($column->type, $texttypes)) {
diff --git a/admin/tool/httpsreplace/cli/url_finder.php b/admin/tool/httpsreplace/cli/url_finder.php
index 82bd3744db7..58831b1755c 100644
--- a/admin/tool/httpsreplace/cli/url_finder.php
+++ b/admin/tool/httpsreplace/cli/url_finder.php
@@ -41,6 +41,11 @@ Example:
     exit(0);
 }
 
+if (!$DB->replace_all_text_supported()) {
+    echo $OUTPUT->notification(get_string('notimplemented', 'tool_httpsreplace'));
+    exit(1);
+}
+
 if (!is_https()) {
     echo $OUTPUT->notification(get_string('httpwarning', 'tool_httpsreplace'), 'warning');
 }
diff --git a/admin/tool/httpsreplace/cli/url_replace.php b/admin/tool/httpsreplace/cli/url_replace.php
index 33e4affbb19..597eb6659c6 100644
--- a/admin/tool/httpsreplace/cli/url_replace.php
+++ b/admin/tool/httpsreplace/cli/url_replace.php
@@ -41,6 +41,11 @@ Example:
     exit(0);
 }
 
+if (!$DB->replace_all_text_supported()) {
+    echo $OUTPUT->notification(get_string('notimplemented', 'tool_httpsreplace'));
+    exit(1);
+}
+
 if (!is_https()) {
     echo $OUTPUT->notification(get_string('httpwarning', 'tool_httpsreplace'), 'warning');
 }