--- a/nashorn/src/jdk/nashorn/internal/runtime/regexp/RegExpScanner.java	Fri May 03 22:47:23 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/regexp/RegExpScanner.java	Fri May 03 22:48:53 2013 +0200
@@ -65,7 +65,7 @@
     /** Are we currently inside a negated character class? */
     private boolean inNegativeClass = false;
 
-    private static final String NON_IDENT_ESCAPES = "$^*+(){}[]|\\.?";
+    private static final String NON_IDENT_ESCAPES = "$^*+(){}[]|\\.?-";
 
     private static class Capture {
         /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8013873.js	Fri May 03 22:48:53 2013 +0200
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8013873: Regexp regression for escaped dash in character class
+ *
+ * @test
+ * @run
+ */
+
+var re = /[a\-c]/;
+print(re.exec("a"));
+print(re.exec("-"));
+print(re.exec("c"));
+print(re.exec("b"));
+print(re.exec("\\"));
+
+re = /^\-$/;
+print(re.exec("-"));
+print(re.exec("\\-"));

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8013873.js.EXPECTED	Fri May 03 22:48:53 2013 +0200
@@ -0,0 +1,7 @@
+a
+-
+c
+null
+null
+-
+null