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diff --git a/intl/icu/source/i18n/regexst.h b/intl/icu/source/i18n/regexst.h
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+++ b/intl/icu/source/i18n/regexst.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+//
+//  regexst.h
+//
+//  Copyright (C) 2003-2010, International Business Machines Corporation and others.
+//  All Rights Reserved.
+//
+//  This file contains declarations for the class RegexStaticSets
+//
+//  This class is internal to the regular expression implementation.
+//  For the public Regular Expression API, see the file "unicode/regex.h"
+//
+//  RegexStaticSets groups together the common UnicodeSets that are needed
+//   for compiling or executing RegularExpressions.  This grouping simplifies
+//   the thread safe lazy creation and sharing of these sets across
+//   all instances of regular expressions.
+//
+
+#ifndef REGEXST_H
+#define REGEXST_H
+
+#include "unicode/utypes.h"
+#include "unicode/utext.h"
+#if !UCONFIG_NO_REGULAR_EXPRESSIONS
+
+#include "regeximp.h"
+
+U_NAMESPACE_BEGIN
+
+class  UnicodeSet;
+
+
+class RegexStaticSets : public UMemory {
+public:
+    static RegexStaticSets *gStaticSets;  // Ptr to all lazily initialized constant
+                                          //   shared sets.
+
+    RegexStaticSets(UErrorCode *status);         
+    ~RegexStaticSets();
+    static void    initGlobals(UErrorCode *status);
+    static UBool   cleanup();
+
+    UnicodeSet    *fPropSets[URX_LAST_SET];     // The sets for common regex items, e.g. \s
+    Regex8BitSet   fPropSets8[URX_LAST_SET];    // Fast bitmap sets for latin-1 range for above.
+
+    UnicodeSet    fRuleSets[10];               // Sets used while parsing regexp patterns.
+    UnicodeSet    fUnescapeCharSet;            // Set of chars handled by unescape when
+                                               //   encountered with a \ in a pattern.
+    UnicodeSet    *fRuleDigitsAlias;
+    UText         *fEmptyText;                 // An empty string, to be used when a matcher
+                                               //   is created with no input.
+
+};
+
+
+U_NAMESPACE_END
+#endif   // !UCONFIG_NO_REGULAR_EXPRESSIONS
+#endif   // REGEXST_H
+