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diff --git a/js/src/tests/non262/RegExp/regress-57631.js b/js/src/tests/non262/RegExp/regress-57631.js
new file mode 100644
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+++ b/js/src/tests/non262/RegExp/regress-57631.js
@@ -0,0 +1,115 @@
+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Date: 26 November 2000
+ *
+ *
+ * SUMMARY:  This test arose from Bugzilla bug 57631:
+ * "RegExp with invalid pattern or invalid flag causes segfault"
+ *
+ * Either error should throw an exception of type SyntaxError,
+ * and we check to see that it does...
+ */
+//-----------------------------------------------------------------------------
+var BUGNUMBER = '57631';
+var summary = 'Testing new RegExp(pattern,flag) with illegal pattern or flag';
+var statprefix = 'Testing for error creating illegal RegExp object on pattern ';
+var statsuffix =  'and flag ';
+var cnSUCCESS = 'SyntaxError';
+var cnFAILURE = 'not a SyntaxError';
+var singlequote = "'";
+var i = -1; var j = -1; var s = ''; var f = '';
+var obj = {};
+var status = ''; var actual = ''; var expect = ''; var msg = '';
+var legalpatterns = new Array(); var illegalpatterns = new Array();
+var legalflags = new Array();  var illegalflags = new Array();
+
+
+// valid regular expressions to try -
+legalpatterns[0] = '';
+legalpatterns[1] = 'abc';
+legalpatterns[2] = '(.*)(3-1)\s\w';
+legalpatterns[3] = '(.*)(...)\\s\\w';
+legalpatterns[4] = '[^A-Za-z0-9_]';
+legalpatterns[5] = '[^\f\n\r\t\v](123.5)([4 - 8]$)';
+
+// invalid regular expressions to try -
+illegalpatterns[0] = '(?)';
+illegalpatterns[1] = '(a';
+illegalpatterns[2] = '( ]';
+//illegalpatterns[3] = '\d{1,s}';
+
+// valid flags to try -
+legalflags[0] = 'i';
+legalflags[1] = 'g';
+legalflags[2] = 'm';
+legalflags[3] = undefined;
+
+// invalid flags to try -
+illegalflags[0] = 'a';
+illegalflags[1] = 123;
+illegalflags[2] = new RegExp();
+
+
+
+//-------------------------------------------------------------------------------------------------
+test();
+//-------------------------------------------------------------------------------------------------
+
+
+function test()
+{
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  testIllegalRegExps(legalpatterns, illegalflags);
+  testIllegalRegExps(illegalpatterns, legalflags);
+  testIllegalRegExps(illegalpatterns, illegalflags);
+}
+
+
+// This function will only be called where all the patterns are illegal, or all the flags
+function testIllegalRegExps(patterns, flags)
+{
+  for (i in patterns)
+  {
+    s = patterns[i];
+ 
+    for (j in flags)
+    {
+      f = flags[j];
+      status = getStatus(s, f);
+      actual = cnFAILURE;
+      expect = cnSUCCESS;
+ 
+      try
+      {
+	// This should cause an exception if either s or f is illegal -        
+	eval('obj = new RegExp(s, f);'); 
+      } 
+      catch(e)
+      {
+	// We expect to get a SyntaxError - test for this:
+	if (e instanceof SyntaxError)
+	  actual = cnSUCCESS;
+      }
+       
+      reportCompare(expect, actual, status);
+    }
+  }
+}
+
+
+function getStatus(regexp, flag)
+{
+  return (statprefix  +  quote(regexp) +  statsuffix  +   quote(flag));
+}
+
+
+function quote(text)
+{
+  return (singlequote  +  text  + singlequote);
+}