From 03cefcc91bcac74e5e11ebcb8859ad489b01bdda Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Tue, 15 Jan 2013 15:56:34 +0000
Subject: [PATCH] MDL-37506 question code: incorrect preg_quote uses.

For preg_quote to work reliably, you must pass the delimiter you are
using for your regular expression. In many places we were failing to do
that.
---
 .../adaptive/tests/walkthrough_test.php       | 14 +++++-----
 .../tests/walkthrough_test.php                |  2 +-
 .../deferredcbm/tests/walkthrough_test.php    | 12 ++++-----
 .../tests/walkthrough_test.php                |  4 +--
 .../immediatecbm/tests/walkthrough_test.php   |  6 ++---
 .../tests/walkthrough_test.php                |  4 +--
 .../tests/walkthrough_test.php                |  2 +-
 .../interactive/tests/walkthrough_test.php    | 10 +++----
 .../tests/walkthrough_test.php                |  2 +-
 .../manualgraded/tests/walkthrough_test.php   | 10 +++----
 .../missing/tests/missingbehaviour_test.php   |  4 +--
 question/engine/questionattempt.php           |  2 +-
 question/engine/questionattemptstep.php       |  2 +-
 question/engine/tests/helpers.php             | 26 +++++++++----------
 .../engine/tests/questionattempt_test.php     |  8 +++---
 .../calculated/tests/walkthrough_test.php     |  2 +-
 .../tests/walkthrough_test.php                |  2 +-
 .../tests/walkthrough_test.php                |  2 +-
 question/type/match/tests/question_test.php   |  6 ++---
 .../missingtype/tests/missingtype_test.php    |  2 +-
 .../multianswer/tests/walkthrough_test.php    |  2 +-
 .../type/multichoice/tests/question_test.php  |  4 +--
 .../type/numerical/tests/walkthrough_test.php |  8 +++---
 question/type/shortanswer/question.php        |  6 ++---
 .../type/truefalse/tests/walkthrough_test.php |  4 +--
 25 files changed, 73 insertions(+), 73 deletions(-)

diff --git a/question/behaviour/adaptive/tests/walkthrough_test.php b/question/behaviour/adaptive/tests/walkthrough_test.php
index b78e4706106..60474a31f9b 100644
--- a/question/behaviour/adaptive/tests/walkthrough_test.php
+++ b/question/behaviour/adaptive/tests/walkthrough_test.php
@@ -43,35 +43,35 @@ class qbehaviour_adaptive_walkthrough_test extends qbehaviour_walkthrough_test_b
     protected function get_contains_penalty_info_expectation($penalty) {
         $penaltyinfo = get_string('gradingdetailspenalty', 'qbehaviour_adaptive',
                                   format_float($penalty, $this->displayoptions->markdp));
-        return new question_pattern_expectation('/'.preg_quote($penaltyinfo).'/');
+        return new question_pattern_expectation('/'.preg_quote($penaltyinfo, '/').'/');
     }
 
     protected function get_does_not_contain_penalty_info_expectation() {
         $penaltyinfo = get_string('gradingdetailspenalty', 'qbehaviour_adaptive', 'XXXXX');
-        $penaltypattern = '/'.str_replace('XXXXX', '\\w*', preg_quote($penaltyinfo)).'/';
+        $penaltypattern = '/'.str_replace('XXXXX', '\\w*', preg_quote($penaltyinfo, '/')).'/';
         return new question_no_pattern_expectation($penaltypattern);
     }
 
     protected function get_contains_total_penalty_expectation($penalty) {
         $penaltyinfo = get_string('gradingdetailspenaltytotal', 'qbehaviour_adaptive',
                                   format_float($penalty, $this->displayoptions->markdp));
-        return new question_pattern_expectation('/'.preg_quote($penaltyinfo).'/');
+        return new question_pattern_expectation('/'.preg_quote($penaltyinfo, '/').'/');
     }
 
     protected function get_does_not_contain_total_penalty_expectation() {
         $penaltyinfo = get_string('gradingdetailspenaltytotal', 'qbehaviour_adaptive', 'XXXXX');
-        $penaltypattern = '/'.str_replace('XXXXX', '\\w*', preg_quote($penaltyinfo)).'/';
+        $penaltypattern = '/'.str_replace('XXXXX', '\\w*', preg_quote($penaltyinfo, '/')).'/';
         return new question_no_pattern_expectation($penaltypattern);
     }
 
     protected function get_contains_disregarded_info_expectation() {
         $penaltyinfo = get_string('disregardedwithoutpenalty', 'qbehaviour_adaptive');
-        return new question_pattern_expectation('/'.preg_quote($penaltyinfo).'/');
+        return new question_pattern_expectation('/'.preg_quote($penaltyinfo, '/').'/');
     }
 
     protected function get_does_not_contain_disregarded_info_expectation() {
         $penaltyinfo = get_string('disregardedwithoutpenalty', 'qbehaviour_adaptive');
-        return new question_no_pattern_expectation('/'.preg_quote($penaltyinfo).'/');
+        return new question_no_pattern_expectation('/'.preg_quote($penaltyinfo, '/').'/');
     }
 
     public function test_adaptive_multichoice() {
@@ -165,7 +165,7 @@ class qbehaviour_adaptive_walkthrough_test extends qbehaviour_walkthrough_test_b
         $this->check_current_mark(1);
         $this->check_current_output(
                 $this->get_contains_mark_summary(1),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $mc->answers[13]->fraction = -0.33333333;
diff --git a/question/behaviour/adaptivenopenalty/tests/walkthrough_test.php b/question/behaviour/adaptivenopenalty/tests/walkthrough_test.php
index 546a5b5caa4..b44f6e3a211 100644
--- a/question/behaviour/adaptivenopenalty/tests/walkthrough_test.php
+++ b/question/behaviour/adaptivenopenalty/tests/walkthrough_test.php
@@ -131,7 +131,7 @@ class qbehaviour_adaptivenopenalty_walkthrough_test extends qbehaviour_walkthrou
         $this->check_current_mark(1);
         $this->check_current_output(
                 $this->get_contains_mark_summary(1),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $mc->answers[13]->fraction = -0.33333333;
diff --git a/question/behaviour/deferredcbm/tests/walkthrough_test.php b/question/behaviour/deferredcbm/tests/walkthrough_test.php
index 852b0680d51..69b7cd13333 100644
--- a/question/behaviour/deferredcbm/tests/walkthrough_test.php
+++ b/question/behaviour/deferredcbm/tests/walkthrough_test.php
@@ -101,7 +101,7 @@ class qbehaviour_deferredcbm_walkthrough_test extends qbehaviour_walkthrough_tes
         $this->check_current_state(question_state::$mangrpartial);
         $this->check_current_mark(1);
         $this->check_current_output(new question_pattern_expectation('/' .
-                preg_quote('Not good enough!') . '/'));
+                preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $tf->rightanswer = false;
@@ -178,7 +178,7 @@ class qbehaviour_deferredcbm_walkthrough_test extends qbehaviour_walkthrough_tes
                 new question_pattern_expectation('/' . preg_quote(
                         get_string('assumingcertainty', 'qbehaviour_deferredcbm',
                         question_cbm::get_string(
-                            $qa->get_last_behaviour_var('_assumedcertainty')))) . '/'));
+                            $qa->get_last_behaviour_var('_assumedcertainty'))), '/') . '/'));
         $this->assertEquals(get_string('true', 'qtype_truefalse'),
                 $this->quba->get_response_summary($this->slot));
     }
@@ -204,9 +204,9 @@ class qbehaviour_deferredcbm_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_contains_incorrect_expectation());
         $this->assertEquals('A [' . question_cbm::get_string(question_cbm::HIGH) . ']',
                 $this->quba->get_right_answer_summary($this->slot));
-        $this->assertRegExp('/' . preg_quote($mc->questiontext) . '/',
+        $this->assertRegExp('/' . preg_quote($mc->questiontext, '/') . '/',
                 $this->quba->get_question_summary($this->slot));
-        $this->assertRegExp('/(B|C) \[' . preg_quote(question_cbm::get_string(2)) . '\]/',
+        $this->assertRegExp('/(B|C) \[' . preg_quote(question_cbm::get_string(2), '/') . '\]/',
                 $this->quba->get_response_summary($this->slot));
 
         // Save the old attempt.
@@ -228,7 +228,7 @@ class qbehaviour_deferredcbm_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_does_not_contain_correctness_expectation());
         $this->assertEquals('A [' . question_cbm::get_string(question_cbm::HIGH) . ']',
                 $this->quba->get_right_answer_summary($this->slot));
-        $this->assertRegExp('/' . preg_quote($mc->questiontext) . '/',
+        $this->assertRegExp('/' . preg_quote($mc->questiontext, '/') . '/',
                 $this->quba->get_question_summary($this->slot));
         $this->assertNull($this->quba->get_response_summary($this->slot));
 
@@ -243,7 +243,7 @@ class qbehaviour_deferredcbm_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_contains_mc_radio_expectation($rightindex, false, true),
                 $this->get_contains_cbm_radio_expectation(3, false, true),
                 $this->get_contains_correct_expectation());
-        $this->assertRegExp('/(A) \[' . preg_quote(question_cbm::get_string(3)) . '\]/',
+        $this->assertRegExp('/(A) \[' . preg_quote(question_cbm::get_string(3), '/') . '\]/',
                 $this->quba->get_response_summary($this->slot));
     }
 
diff --git a/question/behaviour/deferredfeedback/tests/walkthrough_test.php b/question/behaviour/deferredfeedback/tests/walkthrough_test.php
index 80faf0c82ba..45c6c9ac80f 100644
--- a/question/behaviour/deferredfeedback/tests/walkthrough_test.php
+++ b/question/behaviour/deferredfeedback/tests/walkthrough_test.php
@@ -52,7 +52,7 @@ class qbehaviour_deferredfeedback_walkthrough_test extends qbehaviour_walkthroug
                 $this->get_does_not_contain_feedback_expectation());
         $this->assertEquals(get_string('true', 'qtype_truefalse'),
                 $this->quba->get_right_answer_summary($this->slot));
-        $this->assertRegExp('/' . preg_quote($tf->questiontext) . '/',
+        $this->assertRegExp('/' . preg_quote($tf->questiontext, '/') . '/',
                 $this->quba->get_question_summary($this->slot));
         $this->assertNull($this->quba->get_response_summary($this->slot));
 
@@ -97,7 +97,7 @@ class qbehaviour_deferredfeedback_walkthrough_test extends qbehaviour_walkthroug
         $this->check_current_state(question_state::$mangrpartial);
         $this->check_current_mark(1);
         $this->check_current_output(
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $tf->rightanswer = false;
diff --git a/question/behaviour/immediatecbm/tests/walkthrough_test.php b/question/behaviour/immediatecbm/tests/walkthrough_test.php
index b0f3d9acb1f..4154dde5758 100644
--- a/question/behaviour/immediatecbm/tests/walkthrough_test.php
+++ b/question/behaviour/immediatecbm/tests/walkthrough_test.php
@@ -60,7 +60,7 @@ class qbehaviour_immediatecbm_walkthrough_test extends qbehaviour_walkthrough_te
                 $this->get_does_not_contain_feedback_expectation());
         $this->assertEquals('A [' . question_cbm::get_string(question_cbm::HIGH) . ']',
                 $this->quba->get_right_answer_summary($this->slot));
-        $this->assertRegExp('/' . preg_quote($mc->questiontext) . '/',
+        $this->assertRegExp('/' . preg_quote($mc->questiontext, '/') . '/',
                 $this->quba->get_question_summary($this->slot));
         $this->assertNull($this->quba->get_response_summary($this->slot));
 
@@ -116,7 +116,7 @@ class qbehaviour_immediatecbm_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_mark(0.5);
         $this->check_current_output(
                 $this->get_contains_partcorrect_expectation(),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $mc->answers[13]->fraction = -0.33333333;
@@ -183,7 +183,7 @@ class qbehaviour_immediatecbm_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_mark(0.5);
         $this->check_current_output(
                 $this->get_contains_partcorrect_expectation(),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
     }
 
     public function test_immediatecbm_feedback_shortanswer_try_to_submit_no_certainty() {
diff --git a/question/behaviour/immediatefeedback/tests/walkthrough_test.php b/question/behaviour/immediatefeedback/tests/walkthrough_test.php
index ebea45ebe35..4708dde876e 100644
--- a/question/behaviour/immediatefeedback/tests/walkthrough_test.php
+++ b/question/behaviour/immediatefeedback/tests/walkthrough_test.php
@@ -123,7 +123,7 @@ class qbehaviour_immediatefeedback_walkthrough_test extends qbehaviour_walkthrou
         $this->check_current_mark(0.5);
         $this->check_current_output(
                 $this->get_contains_partcorrect_expectation(),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the correct answer to the question, and regrade.
         $mc->answers[13]->fraction = -0.33333333;
@@ -192,7 +192,7 @@ class qbehaviour_immediatefeedback_walkthrough_test extends qbehaviour_walkthrou
         $this->check_current_mark(0.5);
         $this->check_current_output(
                 $this->get_contains_partcorrect_expectation(),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
     }
 
     public function test_immediatefeedback_feedback_multichoice_wrong_on_finish() {
diff --git a/question/behaviour/informationitem/tests/walkthrough_test.php b/question/behaviour/informationitem/tests/walkthrough_test.php
index d2b4744861a..544d3d96eae 100644
--- a/question/behaviour/informationitem/tests/walkthrough_test.php
+++ b/question/behaviour/informationitem/tests/walkthrough_test.php
@@ -79,7 +79,7 @@ class qbehaviour_informationitem_walkthrough_test extends qbehaviour_walkthrough
         $this->check_current_state(question_state::$manfinished);
         $this->check_current_mark(null);
         $this->check_current_output(
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Check that trying to process a manual comment with a grade causes an exception.
         $this->setExpectedException('moodle_exception');
diff --git a/question/behaviour/interactive/tests/walkthrough_test.php b/question/behaviour/interactive/tests/walkthrough_test.php
index 4af3490607b..ee23cf8acbe 100644
--- a/question/behaviour/interactive/tests/walkthrough_test.php
+++ b/question/behaviour/interactive/tests/walkthrough_test.php
@@ -99,7 +99,7 @@ class qbehaviour_interactive_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_contains_try_again_button_expectation(true),
                 $this->get_does_not_contain_correctness_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint'));
 
         // Check that, if we review in this state, the try again button is disabled.
@@ -165,7 +165,7 @@ class qbehaviour_interactive_walkthrough_test extends qbehaviour_walkthrough_tes
         $this->check_current_output(
                 $this->get_contains_mark_summary(0.5),
                 $this->get_contains_partcorrect_expectation(),
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Check regrading does not mess anything up.
         $this->quba->regrade_all_questions();
@@ -224,7 +224,7 @@ class qbehaviour_interactive_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_contains_try_again_button_expectation(true),
                 $this->get_does_not_contain_correctness_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint'));
 
         // Finish the attempt.
@@ -289,7 +289,7 @@ class qbehaviour_interactive_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_does_not_contain_validation_error_expectation(),
                 $this->get_contains_try_again_button_expectation(true),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint'));
         $this->assertEquals('newt',
                 $this->quba->get_response_summary($this->slot));
@@ -387,7 +387,7 @@ class qbehaviour_interactive_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_contains_try_again_button_expectation(true),
                 $this->get_does_not_contain_correctness_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint'),
                 $this->get_contains_num_parts_correct(1),
                 $this->get_contains_standard_incorrect_combined_feedback_expectation(),
diff --git a/question/behaviour/interactivecountback/tests/walkthrough_test.php b/question/behaviour/interactivecountback/tests/walkthrough_test.php
index 844ec222880..aa577b81545 100644
--- a/question/behaviour/interactivecountback/tests/walkthrough_test.php
+++ b/question/behaviour/interactivecountback/tests/walkthrough_test.php
@@ -91,7 +91,7 @@ class qbehaviour_interactivecountback_walkthrough_test extends qbehaviour_walkth
                 $this->get_contains_try_again_button_expectation(true),
                 $this->get_does_not_contain_correctness_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint'),
                 $this->get_contains_num_parts_correct(2),
                 $this->get_contains_standard_partiallycorrect_combined_feedback_expectation(),
diff --git a/question/behaviour/manualgraded/tests/walkthrough_test.php b/question/behaviour/manualgraded/tests/walkthrough_test.php
index 32af7296692..2b8a4621ae6 100644
--- a/question/behaviour/manualgraded/tests/walkthrough_test.php
+++ b/question/behaviour/manualgraded/tests/walkthrough_test.php
@@ -96,7 +96,7 @@ class qbehaviour_manualgraded_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_state(question_state::$mangrright);
         $this->check_current_mark(10);
         $this->check_current_output(
-                new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
 
         // Now change the max mark for the question and regrade.
         $this->quba->regrade_question($this->slot, true, 1);
@@ -147,7 +147,7 @@ class qbehaviour_manualgraded_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_output(
             $this->get_does_not_contain_correctness_expectation(),
             $this->get_does_not_contain_specific_feedback_expectation(),
-            new question_pattern_expectation('/' . preg_quote('Not good enough!') . '/'));
+            new question_pattern_expectation('/' . preg_quote('Not good enough!', '/') . '/'));
     }
 
     public function test_manual_graded_ignore_repeat_sumbission() {
@@ -194,7 +194,7 @@ class qbehaviour_manualgraded_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_mark(null);
         $this->check_current_output(
                 new question_pattern_expectation('/' .
-                        preg_quote('I am not sure what grade to award.') . '/'));
+                        preg_quote('I am not sure what grade to award.', '/') . '/'));
 
         // Now grade it.
         $this->manual_grade('Pretty good!', '9.00000');
@@ -202,7 +202,7 @@ class qbehaviour_manualgraded_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_state(question_state::$mangrpartial);
         $this->check_current_mark(9);
         $this->check_current_output(
-                new question_pattern_expectation('/' . preg_quote('Pretty good!') . '/'));
+                new question_pattern_expectation('/' . preg_quote('Pretty good!', '/') . '/'));
 
         // Process the same data again, and make sure it does not add a step.
         $this->manual_grade('Pretty good!', '9.00000');
@@ -217,7 +217,7 @@ class qbehaviour_manualgraded_walkthrough_test extends qbehaviour_walkthrough_te
         $this->check_current_mark(null);
         $this->check_current_output(
                 new question_pattern_expectation('/' .
-                        preg_quote('Actually, I am not sure any more.') . '/'));
+                        preg_quote('Actually, I am not sure any more.', '/') . '/'));
 
         $qa = $this->quba->get_question_attempt($this->slot);
         $this->assertEquals('Commented: Actually, I am not sure any more.',
diff --git a/question/behaviour/missing/tests/missingbehaviour_test.php b/question/behaviour/missing/tests/missingbehaviour_test.php
index 6c43c67c368..4922ae7b458 100644
--- a/question/behaviour/missing/tests/missingbehaviour_test.php
+++ b/question/behaviour/missing/tests/missingbehaviour_test.php
@@ -101,9 +101,9 @@ class qbehaviour_missing_test extends advanced_testcase {
         $this->assertEquals(array('-submit' => '1', 'choice0' => '1'), $step->get_all_data());
 
         $output = $qa->render(new question_display_options(), '1');
-        $this->assertRegExp('/' . preg_quote($qa->get_question()->questiontext) . '/', $output);
+        $this->assertRegExp('/' . preg_quote($qa->get_question()->questiontext, '/') . '/', $output);
         $this->assertRegExp('/' . preg_quote(
-                get_string('questionusedunknownmodel', 'qbehaviour_missing')) . '/', $output);
+                get_string('questionusedunknownmodel', 'qbehaviour_missing'), '/') . '/', $output);
         $this->assertTag(array('tag'=>'div', 'attributes'=>array('class'=>'warning')), $output);
     }
 }
diff --git a/question/engine/questionattempt.php b/question/engine/questionattempt.php
index 57041f0b7f3..c4d6061220a 100644
--- a/question/engine/questionattempt.php
+++ b/question/engine/questionattempt.php
@@ -958,7 +958,7 @@ class question_attempt {
             $postdata = $_POST;
         }
 
-        $pattern = '/^' . preg_quote($this->get_field_prefix()) . '[^-:]/';
+        $pattern = '/^' . preg_quote($this->get_field_prefix(), '/') . '[^-:]/';
         $prefixlen = strlen($this->get_field_prefix());
 
         $submitteddata = array();
diff --git a/question/engine/questionattemptstep.php b/question/engine/questionattemptstep.php
index 20a34da5c81..5cbd5c8a65c 100644
--- a/question/engine/questionattemptstep.php
+++ b/question/engine/questionattemptstep.php
@@ -534,7 +534,7 @@ class question_attempt_step_subquestion_adapter extends question_attempt_step {
      * null if the extre prefix was not present.
      */
     public function remove_prefix($field) {
-        if (preg_match('~^(-?_?)' . preg_quote($this->extraprefix) . '(.*)$~', $field, $matches)) {
+        if (preg_match('~^(-?_?)' . preg_quote($this->extraprefix, '~') . '(.*)$~', $field, $matches)) {
             return $matches[1] . $matches[2];
         } else {
             return null;
diff --git a/question/engine/tests/helpers.php b/question/engine/tests/helpers.php
index c3f7611f21a..cc8fbfe43e5 100644
--- a/question/engine/tests/helpers.php
+++ b/question/engine/tests/helpers.php
@@ -697,11 +697,11 @@ abstract class qbehaviour_walkthrough_test_base extends question_testcase {
     }
 
     protected function get_contains_question_text_expectation($question) {
-        return new question_pattern_expectation('/' . preg_quote($question->questiontext) . '/');
+        return new question_pattern_expectation('/' . preg_quote($question->questiontext, '/') . '/');
     }
 
     protected function get_contains_general_feedback_expectation($question) {
-        return new question_pattern_expectation('/' . preg_quote($question->generalfeedback) . '/');
+        return new question_pattern_expectation('/' . preg_quote($question->generalfeedback, '/') . '/');
     }
 
     protected function get_does_not_contain_correctness_expectation() {
@@ -709,31 +709,31 @@ abstract class qbehaviour_walkthrough_test_base extends question_testcase {
     }
 
     protected function get_contains_correct_expectation() {
-        return new question_pattern_expectation('/' . preg_quote(get_string('correct', 'question')) . '/');
+        return new question_pattern_expectation('/' . preg_quote(get_string('correct', 'question'), '/') . '/');
     }
 
     protected function get_contains_partcorrect_expectation() {
         return new question_pattern_expectation('/' .
-            preg_quote(get_string('partiallycorrect', 'question')) . '/');
+            preg_quote(get_string('partiallycorrect', 'question'), '/') . '/');
     }
 
     protected function get_contains_incorrect_expectation() {
-        return new question_pattern_expectation('/' . preg_quote(get_string('incorrect', 'question')) . '/');
+        return new question_pattern_expectation('/' . preg_quote(get_string('incorrect', 'question'), '/') . '/');
     }
 
     protected function get_contains_standard_correct_combined_feedback_expectation() {
         return new question_pattern_expectation('/' .
-            preg_quote(test_question_maker::STANDARD_OVERALL_CORRECT_FEEDBACK) . '/');
+            preg_quote(test_question_maker::STANDARD_OVERALL_CORRECT_FEEDBACK, '/') . '/');
     }
 
     protected function get_contains_standard_partiallycorrect_combined_feedback_expectation() {
         return new question_pattern_expectation('/' .
-            preg_quote(test_question_maker::STANDARD_OVERALL_PARTIALLYCORRECT_FEEDBACK) . '/');
+            preg_quote(test_question_maker::STANDARD_OVERALL_PARTIALLYCORRECT_FEEDBACK, '/') . '/');
     }
 
     protected function get_contains_standard_incorrect_combined_feedback_expectation() {
         return new question_pattern_expectation('/' .
-            preg_quote(test_question_maker::STANDARD_OVERALL_INCORRECT_FEEDBACK) . '/');
+            preg_quote(test_question_maker::STANDARD_OVERALL_INCORRECT_FEEDBACK, '/') . '/');
     }
 
     protected function get_does_not_contain_feedback_expectation() {
@@ -748,7 +748,7 @@ abstract class qbehaviour_walkthrough_test_base extends question_testcase {
         $a = new stdClass();
         $a->num = $num;
         return new question_pattern_expectation('/<div class="numpartscorrect">' .
-            preg_quote(get_string('yougotnright', 'question', $a)) . '/');
+            preg_quote(get_string('yougotnright', 'question', $a), '/') . '/');
     }
 
     protected function get_does_not_contain_specific_feedback_expectation() {
@@ -769,14 +769,14 @@ abstract class qbehaviour_walkthrough_test_base extends question_testcase {
         $a->max = format_float($this->quba->get_question_max_mark($this->slot),
             $this->displayoptions->markdp);
         return new question_pattern_expectation('/' .
-            preg_quote(get_string('markoutofmax', 'question', $a)) . '/');
+            preg_quote(get_string('markoutofmax', 'question', $a), '/') . '/');
     }
 
     protected function get_contains_marked_out_of_summary() {
         $max = format_float($this->quba->get_question_max_mark($this->slot),
             $this->displayoptions->markdp);
         return new question_pattern_expectation('/' .
-            preg_quote(get_string('markedoutofmax', 'question', $max)) . '/');
+            preg_quote(get_string('markedoutofmax', 'question', $max), '/') . '/');
     }
 
     protected function get_does_not_contain_mark_summary() {
@@ -894,12 +894,12 @@ abstract class qbehaviour_walkthrough_test_base extends question_testcase {
 
     protected function get_tries_remaining_expectation($n) {
         return new question_pattern_expectation('/' .
-            preg_quote(get_string('triesremaining', 'qbehaviour_interactive', $n)) . '/');
+            preg_quote(get_string('triesremaining', 'qbehaviour_interactive', $n), '/') . '/');
     }
 
     protected function get_invalid_answer_expectation() {
         return new question_pattern_expectation('/' .
-            preg_quote(get_string('invalidanswer', 'question')) . '/');
+            preg_quote(get_string('invalidanswer', 'question'), '/') . '/');
     }
 
     protected function get_contains_try_again_button_expectation($enabled = null) {
diff --git a/question/engine/tests/questionattempt_test.php b/question/engine/tests/questionattempt_test.php
index 3ee67798763..aaf2926c31f 100644
--- a/question/engine/tests/questionattempt_test.php
+++ b/question/engine/tests/questionattempt_test.php
@@ -87,21 +87,21 @@ class question_attempt_test extends advanced_testcase {
 
     public function test_get_qt_field_name() {
         $name = $this->qa->get_qt_field_name('test');
-        $this->assertRegExp('/^' . preg_quote($this->qa->get_field_prefix()) . '/', $name);
+        $this->assertRegExp('/^' . preg_quote($this->qa->get_field_prefix(), '/') . '/', $name);
         $this->assertRegExp('/_test$/', $name);
     }
 
     public function test_get_behaviour_field_name() {
         $name = $this->qa->get_behaviour_field_name('test');
-        $this->assertRegExp('/^' . preg_quote($this->qa->get_field_prefix()) . '/', $name);
+        $this->assertRegExp('/^' . preg_quote($this->qa->get_field_prefix(), '/') . '/', $name);
         $this->assertRegExp('/_-test$/', $name);
     }
 
     public function test_get_field_prefix() {
         $this->qa->set_slot(7);
         $name = $this->qa->get_field_prefix();
-        $this->assertRegExp('/' . preg_quote($this->usageid) . '/', $name);
-        $this->assertRegExp('/' . preg_quote($this->qa->get_slot()) . '/', $name);
+        $this->assertRegExp('/' . preg_quote($this->usageid, '/') . '/', $name);
+        $this->assertRegExp('/' . preg_quote($this->qa->get_slot(), '/') . '/', $name);
     }
 
     public function test_get_submitted_var_not_present_var_returns_null() {
diff --git a/question/type/calculated/tests/walkthrough_test.php b/question/type/calculated/tests/walkthrough_test.php
index c8b635227c5..11b7ebc01e7 100644
--- a/question/type/calculated/tests/walkthrough_test.php
+++ b/question/type/calculated/tests/walkthrough_test.php
@@ -86,7 +86,7 @@ class qtype_calculated_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
 
diff --git a/question/type/calculatedmulti/tests/walkthrough_test.php b/question/type/calculatedmulti/tests/walkthrough_test.php
index c4b36c273b6..de31a58c45b 100644
--- a/question/type/calculatedmulti/tests/walkthrough_test.php
+++ b/question/type/calculatedmulti/tests/walkthrough_test.php
@@ -86,7 +86,7 @@ class qtype_calculatedmulti_walkthrough_test extends qbehaviour_walkthrough_test
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
 
diff --git a/question/type/calculatedsimple/tests/walkthrough_test.php b/question/type/calculatedsimple/tests/walkthrough_test.php
index 17a95633f4b..63e639fb804 100644
--- a/question/type/calculatedsimple/tests/walkthrough_test.php
+++ b/question/type/calculatedsimple/tests/walkthrough_test.php
@@ -85,7 +85,7 @@ class qtype_calculatedsimple_walkthrough_test extends qbehaviour_walkthrough_tes
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
 
diff --git a/question/type/match/tests/question_test.php b/question/type/match/tests/question_test.php
index 043c5a7f413..ff0e73ee1b9 100644
--- a/question/type/match/tests/question_test.php
+++ b/question/type/match/tests/question_test.php
@@ -134,12 +134,12 @@ class qtype_match_question_test extends advanced_testcase {
         $match = test_question_maker::make_a_matching_question();
         $match->start_attempt(new question_attempt_step(), 1);
         $qsummary = $match->get_question_summary();
-        $this->assertRegExp('/' . preg_quote($match->questiontext) . '/', $qsummary);
+        $this->assertRegExp('/' . preg_quote($match->questiontext, '/') . '/', $qsummary);
         foreach ($match->stems as $stem) {
-            $this->assertRegExp('/' . preg_quote($stem) . '/', $qsummary);
+            $this->assertRegExp('/' . preg_quote($stem, '/') . '/', $qsummary);
         }
         foreach ($match->choices as $choice) {
-            $this->assertRegExp('/' . preg_quote($choice) . '/', $qsummary);
+            $this->assertRegExp('/' . preg_quote($choice, '/') . '/', $qsummary);
         }
     }
 
diff --git a/question/type/missingtype/tests/missingtype_test.php b/question/type/missingtype/tests/missingtype_test.php
index 6824e214152..97f81bb9bf0 100644
--- a/question/type/missingtype/tests/missingtype_test.php
+++ b/question/type/missingtype/tests/missingtype_test.php
@@ -107,7 +107,7 @@ class qtype_missing_test extends question_testcase {
         $this->assertRegExp('/' .
                 preg_quote($qa->get_question()->questiontext, '/') . '/', $output);
         $this->assertRegExp('/' .
-                preg_quote(get_string('missingqtypewarning', 'qtype_missingtype')) . '/', $output);
+                preg_quote(get_string('missingqtypewarning', 'qtype_missingtype'), '/') . '/', $output);
         $this->assert(new question_contains_tag_with_attribute(
                 'div', 'class', 'warning missingqtypewarning'), $output);
     }
diff --git a/question/type/multianswer/tests/walkthrough_test.php b/question/type/multianswer/tests/walkthrough_test.php
index 78361f0da13..ce7400f206d 100644
--- a/question/type/multianswer/tests/walkthrough_test.php
+++ b/question/type/multianswer/tests/walkthrough_test.php
@@ -367,7 +367,7 @@ class qtype_multianswer_walkthrough_test extends qbehaviour_walkthrough_test_bas
                 $this->get_contains_try_again_button_expectation(true),
                 $this->get_does_not_contain_correctness_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive')) . '/'),
+                        preg_quote(get_string('notcomplete', 'qbehaviour_interactive'), '/') . '/'),
                 $this->get_contains_hint_expectation('This is the first hint.'));
 
         // Check that extract responses will return the reset data.
diff --git a/question/type/multichoice/tests/question_test.php b/question/type/multichoice/tests/question_test.php
index cbd3827f5ea..9e44f816826 100644
--- a/question/type/multichoice/tests/question_test.php
+++ b/question/type/multichoice/tests/question_test.php
@@ -224,9 +224,9 @@ class qtype_multichoice_multi_question_test extends advanced_testcase {
 
         $qsummary = $mc->get_question_summary();
 
-        $this->assertRegExp('/' . preg_quote($mc->questiontext) . '/', $qsummary);
+        $this->assertRegExp('/' . preg_quote($mc->questiontext, '/') . '/', $qsummary);
         foreach ($mc->answers as $answer) {
-            $this->assertRegExp('/' . preg_quote($answer->answer) . '/', $qsummary);
+            $this->assertRegExp('/' . preg_quote($answer->answer, '/') . '/', $qsummary);
         }
     }
 
diff --git a/question/type/numerical/tests/walkthrough_test.php b/question/type/numerical/tests/walkthrough_test.php
index b8afaf6e08b..bac4a2e1d11 100644
--- a/question/type/numerical/tests/walkthrough_test.php
+++ b/question/type/numerical/tests/walkthrough_test.php
@@ -85,7 +85,7 @@ class qtype_numerical_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
 
@@ -145,7 +145,7 @@ class qtype_numerical_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
 
@@ -227,7 +227,7 @@ class qtype_numerical_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('invalidnumber', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('invalidnumber', 'qtype_numerical'), '/') . '/'),
                 $this->get_contains_select_expectation('unit', $unitchoices, 'cm', true),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
@@ -242,7 +242,7 @@ class qtype_numerical_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_does_not_contain_feedback_expectation(),
                 $this->get_contains_validation_error_expectation(),
                 new question_pattern_expectation('/' .
-                        preg_quote(get_string('unitnotselected', 'qtype_numerical') . '/')),
+                        preg_quote(get_string('unitnotselected', 'qtype_numerical'), '/') . '/'),
                 $this->get_contains_select_expectation('unit', $unitchoices, '', true),
                 $this->get_does_not_contain_try_again_button_expectation(),
                 $this->get_no_hint_visible_expectation());
diff --git a/question/type/shortanswer/question.php b/question/type/shortanswer/question.php
index d46f4e0707b..cb3c8a493f8 100644
--- a/question/type/shortanswer/question.php
+++ b/question/type/shortanswer/question.php
@@ -90,12 +90,12 @@ class qtype_shortanswer_question extends question_graded_by_strategy
         // Break the string on non-escaped asterisks.
         $bits = preg_split('/(?<!\\\\)\*/', $pattern);
         // Escape regexp special characters in the bits.
-        $excapedbits = array();
+        $escapedbits = array();
         foreach ($bits as $bit) {
-            $excapedbits[] = preg_quote(str_replace('\*', '*', $bit));
+            $escapedbits[] = preg_quote(str_replace('\*', '*', $bit), '|');
         }
         // Put it back together to make the regexp.
-        $regexp = '|^' . implode('.*', $excapedbits) . '$|u';
+        $regexp = '|^' . implode('.*', $escapedbits) . '$|u';
 
         // Make the match insensitive if requested to.
         if ($ignorecase) {
diff --git a/question/type/truefalse/tests/walkthrough_test.php b/question/type/truefalse/tests/walkthrough_test.php
index 2e617d2bb7e..0a63ad7698c 100644
--- a/question/type/truefalse/tests/walkthrough_test.php
+++ b/question/type/truefalse/tests/walkthrough_test.php
@@ -54,7 +54,7 @@ class qtype_truefalse_walkthrough_test extends qbehaviour_walkthrough_test_base
                         get_string('questiontext', 'question')));
         $this->assertEquals(get_string('false', 'qtype_truefalse'),
                 $this->quba->get_right_answer_summary($this->slot));
-        $this->assertRegExp('/' . preg_quote($tf->questiontext) . '/',
+        $this->assertRegExp('/' . preg_quote($tf->questiontext, '/') . '/',
                 $this->quba->get_question_summary($this->slot));
         $this->assertNull($this->quba->get_response_summary($this->slot));
 
@@ -69,7 +69,7 @@ class qtype_truefalse_walkthrough_test extends qbehaviour_walkthrough_test_base
                 $this->get_contains_tf_false_radio_expectation(false, false),
 
                 // In particular, check that the false feedback is not displayed.
-                new question_no_pattern_expectation('/' . preg_quote($tf->falsefeedback) . '/'));
+                new question_no_pattern_expectation('/' . preg_quote($tf->falsefeedback, '/') . '/'));
 
     }
 }
-- 
2.17.1