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diff --git a/test/src/regex-tests.el b/test/src/regex-tests.el
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+;;; regex-tests.el --- tests for regex.c functions -*- lexical-binding: t -*-
+
+;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+
+(ert-deftest regex-word-cc-fallback-test ()
+  "Test that ‘[[:cc:]]*x’ matches ‘x’ (bug#24020).
+
+Test that a regex of the form \"[[:cc:]]*x\" where CC is
+a character class which matches a multibyte character X, matches
+string \"x\".
+
+For example, ‘[[:word:]]*\u2620’ regex (note: \u2620 is a word
+character) must match a string \"\u2420\"."
+  (dolist (class '("[[:word:]]" "\\sw"))
+    (dolist (repeat '("*" "+"))
+      (dolist (suffix '("" "b" "bar" "\u2620"))
+        (dolist (string '("" "foo"))
+          (when (not (and (string-equal repeat "+")
+                          (string-equal string "")))
+            (should (string-match (concat "^" class repeat suffix "$")
+                                  (concat string suffix)))))))))
+
+(defun regex--test-cc (name matching not-matching)
+  (should (string-match-p (concat "^[[:" name ":]]*$") matching))
+  (should (string-match-p (concat "^[[:" name ":]]*?\u2622$")
+                          (concat matching "\u2622")))
+  (should (string-match-p (concat "^[^[:" name ":]]*$") not-matching))
+  (should (string-match-p (concat "^[^[:" name ":]]*\u2622$")
+                          (concat not-matching "\u2622")))
+  (with-temp-buffer
+    (insert matching)
+    (let ((p (point)))
+      (insert not-matching)
+      (goto-char (point-min))
+      (skip-chars-forward (concat "[:" name ":]"))
+      (should (equal (point) p))
+      (skip-chars-forward (concat "^[:" name ":]"))
+      (should (equal (point) (point-max)))
+      (goto-char (point-min))
+      (skip-chars-forward (concat "[:" name ":]\u2622"))
+      (should (or (equal (point) p) (equal (point) (1+ p)))))))
+
+(ert-deftest regex-character-classes ()
+  "Perform sanity test of regexes using character classes.
+
+Go over all the supported character classes and test whether the
+classes and their inversions match what they are supposed to
+match.  The test is done using `string-match-p' as well as
+`skip-chars-forward'."
+  (let (case-fold-search)
+    (regex--test-cc "alnum" "abcABC012łąka" "-, \t\n")
+    (regex--test-cc "alpha" "abcABCłąka" "-,012 \t\n")
+    (regex--test-cc "digit" "012" "abcABCłąka-, \t\n")
+    (regex--test-cc "xdigit" "0123aBc" "łąk-, \t\n")
+    (regex--test-cc "upper" "ABCŁĄKA" "abc012-, \t\n")
+    (regex--test-cc "lower" "abcłąka" "ABC012-, \t\n")
+
+    (regex--test-cc "word" "abcABC012\u2620" "-, \t\n")
+
+    (regex--test-cc "punct" ".,-" "abcABC012\u2620 \t\n")
+    (regex--test-cc "cntrl" "\1\2\t\n" ".,-abcABC012\u2620 ")
+    (regex--test-cc "graph" "abcłąka\u2620-," " \t\n\1")
+    (regex--test-cc "print" "abcłąka\u2620-, " "\t\n\1")
+
+    (regex--test-cc "space" " \t\n\u2001" "abcABCł0123")
+    (regex--test-cc "blank" " \t" "\n\u2001")
+
+    (regex--test-cc "ascii" "abcABC012 \t\n\1" "łą\u2620")
+    (regex--test-cc "nonascii" "łą\u2622" "abcABC012 \t\n\1")
+    (regex--test-cc "unibyte" "abcABC012 \t\n\1" "łą\u2622")
+    (regex--test-cc "multibyte" "łą\u2622" "abcABC012 \t\n\1")))
+
+;;; regex-tests.el ends here