Attachment 349187 Details for Bug 189407 – Patch

[patch] Patch

189407.patch (text/plain), 21.30 KB, created by Michael Saboff on 2018-09-07 14:03:35 PDT

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Creator: Michael Saboff

Created: 2018-09-07 14:03:35 PDT

Size: 21.30 KB

patch

obsolete

>Index: JSTests/ChangeLog
>===================================================================
>--- JSTests/ChangeLog	(revision 235803)
>+++ JSTests/ChangeLog	(working copy)
>@@ -1,3 +1,15 @@
>+2018-09-07  Michael Saboff  <msaboff@apple.com>
>+
>+        Test262 failure with Named Capture Groups - using a reference before the group is defined
>+        https://bugs.webkit.org/show_bug.cgi?id=189407
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Re-enabled previously failing test.
>+
>+        * test262.yaml:
>+        * test262/expectations.yaml
>+
> 2018-09-06  Yusuke Suzuki  <yusukesuzuki@slowstart.org>
> 
>         [DFG] DFG should handle String#toString
>Index: JSTests/test262.yaml
>===================================================================
>--- JSTests/test262.yaml	(revision 235763)
>+++ JSTests/test262.yaml	(working copy)
>@@ -42180,9 +42180,9 @@
> - path: test262/test/built-ins/RegExp/named-groups/non-unicode-property-names.js
>   cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], [:strict]
> - path: test262/test/built-ins/RegExp/named-groups/non-unicode-references.js
>-  cmd: runTest262 :fail, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], []
>+  cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], []
> - path: test262/test/built-ins/RegExp/named-groups/non-unicode-references.js
>-  cmd: runTest262 :fail, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], [:strict]
>+  cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], [:strict]
> - path: test262/test/built-ins/RegExp/named-groups/string-replace-escaped.js
>   cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js"], []
> - path: test262/test/built-ins/RegExp/named-groups/string-replace-escaped.js
>@@ -42224,9 +42224,9 @@
> - path: test262/test/built-ins/RegExp/named-groups/unicode-property-names.js
>   cmd: runTest262 :fail, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js"], [:strict]
> - path: test262/test/built-ins/RegExp/named-groups/unicode-references.js
>-  cmd: runTest262 :fail, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], []
>+  cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], []
> - path: test262/test/built-ins/RegExp/named-groups/unicode-references.js
>-  cmd: runTest262 :fail, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], [:strict]
>+  cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js", "../../../../harness/compareArray.js"], [:strict]
> - path: test262/test/built-ins/RegExp/property-escapes/binary-properties-with-value.js
>   cmd: runTest262 :normal, "NoException", ["../../../../harness/assert.js", "../../../../harness/sta.js"], []
> - path: test262/test/built-ins/RegExp/property-escapes/binary-properties-with-value.js
>Index: JSTests/test262/expectations.yaml
>===================================================================
>--- JSTests/test262/expectations.yaml	(revision 235763)
>+++ JSTests/test262/expectations.yaml	(working copy)
>@@ -1122,9 +1122,6 @@ test/built-ins/RegExp/named-groups/group
> test/built-ins/RegExp/named-groups/non-unicode-malformed.js:
>   default: 'Test262Error: Expected a SyntaxError to be thrown but no exception was thrown at all'
>   strict mode: 'Test262Error: Expected a SyntaxError to be thrown but no exception was thrown at all'
>-test/built-ins/RegExp/named-groups/non-unicode-references.js:
>-  default: "TypeError: null is not an object (evaluating 'b.length')"
>-  strict mode: "TypeError: null is not an object (evaluating 'b.length')"
> test/built-ins/RegExp/named-groups/string-replace-nocaptures.js:
>   default: 'Test262Error: Expected SameValue(ÃÂ«$<snd>$<fst>cdÃÂ», ÃÂ«$<$<fst>cdÃÂ») to be true'
>   strict mode: 'Test262Error: Expected SameValue(ÃÂ«$<snd>$<fst>cdÃÂ», ÃÂ«$<$<fst>cdÃÂ») to be true'
>@@ -1134,9 +1131,6 @@ test/built-ins/RegExp/named-groups/unico
> test/built-ins/RegExp/named-groups/unicode-property-names.js:
>   default: 'SyntaxError: Invalid regular expression: invalid group specifier name'
>   strict mode: 'SyntaxError: Invalid regular expression: invalid group specifier name'
>-test/built-ins/RegExp/named-groups/unicode-references.js:
>-  default: 'SyntaxError: Invalid regular expression: invalid backreference for unicode pattern'
>-  strict mode: 'SyntaxError: Invalid regular expression: invalid backreference for unicode pattern'
> test/built-ins/RegExp/proto-from-ctor-realm.js:
>   default: 'Test262Error: Expected SameValue(ÃÂ«/(?:)/ÃÂ», ÃÂ«/(?:)/ÃÂ») to be true'
>   strict mode: 'Test262Error: Expected SameValue(ÃÂ«/(?:)/ÃÂ», ÃÂ«/(?:)/ÃÂ») to be true'
>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 235763)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,40 @@
>+2018-09-07  Michael Saboff  <msaboff@apple.com>
>+
>+        Test262 failure with Named Capture Groups - using a reference before the group is defined
>+        https://bugs.webkit.org/show_bug.cgi?id=189407
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Added code to save the named forward references we see during parsing and validating that
>+        they are all present when parsing the RegExp is complete.  If there are unnamed references,
>+        we reparse with some variation of behavior.  Just like for numeric references, the
>+        behavior is different depending on whether or not the unicode (u flag) is present.  
>+        For non-unicode patterns, we treat the \k<...> as a literal pattern.  For a unicode 
>+        pattern we throw an exception.
>+
>+        Did some refactoring, renaming YarrPattern::reset() and YarrPatternConstructor::reset()
>+        resetForReparsing() as that is the only use for those methods.
>+
>+        * yarr/YarrParser.h:
>+        (JSC::Yarr::Parser::CharacterClassParserDelegate::isValidNamedForwardReference):
>+        (JSC::Yarr::Parser::CharacterClassParserDelegate::atomNamedForwardReference):
>+        (JSC::Yarr::Parser::parseEscape):
>+        * yarr/YarrPattern.cpp:
>+        (JSC::Yarr::YarrPatternConstructor::resetForReparsing):
>+        (JSC::Yarr::YarrPatternConstructor::saveUnmatchedNamedForwardReferences):
>+        (JSC::Yarr::YarrPatternConstructor::isValidNamedForwardReference):
>+        (JSC::Yarr::YarrPatternConstructor::atomNamedForwardReference):
>+        (JSC::Yarr::YarrPattern::compile):
>+        (JSC::Yarr::YarrPattern::YarrPattern):
>+        (JSC::Yarr::YarrPatternConstructor::reset): Deleted.
>+        * yarr/YarrPattern.h:
>+        (JSC::Yarr::YarrPattern::resetForReparsing):
>+        (JSC::Yarr::YarrPattern::containsIllegalNamedForwardReferences):
>+        (JSC::Yarr::YarrPattern::reset): Deleted.
>+        * yarr/YarrSyntaxChecker.cpp:
>+        (JSC::Yarr::SyntaxChecker::isValidNamedForwardReference):
>+        (JSC::Yarr::SyntaxChecker::atomNamedForwardReference):
>+
> 2018-09-06  Mark Lam  <mark.lam@apple.com>
> 
>         Gardening: only visit m_cachedStructureID if it's not null.
>Index: Source/JavaScriptCore/yarr/YarrParser.h
>===================================================================
>--- Source/JavaScriptCore/yarr/YarrParser.h	(revision 235763)
>+++ Source/JavaScriptCore/yarr/YarrParser.h	(working copy)
>@@ -195,6 +195,8 @@ private:
>         NO_RETURN_DUE_TO_ASSERT void assertionWordBoundary(bool) { RELEASE_ASSERT_NOT_REACHED(); }
>         NO_RETURN_DUE_TO_ASSERT void atomBackReference(unsigned) { RELEASE_ASSERT_NOT_REACHED(); }
>         NO_RETURN_DUE_TO_ASSERT void atomNamedBackReference(String) { RELEASE_ASSERT_NOT_REACHED(); }
>+        NO_RETURN_DUE_TO_ASSERT bool isValidNamedForwardReference(String) { RELEASE_ASSERT_NOT_REACHED(); }
>+        NO_RETURN_DUE_TO_ASSERT void atomNamedForwardReference(String) { RELEASE_ASSERT_NOT_REACHED(); }
> 
>     private:
>         Delegate& m_delegate;
>@@ -421,9 +423,16 @@ private:
>             if (!atEndOfPattern() && !inCharacterClass) {
>                 if (consume() == '<') {
>                     auto groupName = tryConsumeGroupName();
>-                    if (groupName && m_captureGroupNames.contains(groupName.value())) {
>-                        delegate.atomNamedBackReference(groupName.value());
>-                        break;
>+                    if (groupName) {
>+                        if (m_captureGroupNames.contains(groupName.value())) {
>+                            delegate.atomNamedBackReference(groupName.value());
>+                            break;
>+                        }
>+                        
>+                        if (delegate.isValidNamedForwardReference(groupName.value())) {
>+                            delegate.atomNamedForwardReference(groupName.value());
>+                            break;
>+                        }
>                     }
>                     if (m_isUnicode) {
>                         m_errorCode = ErrorCode::InvalidBackreference;
>@@ -1137,6 +1146,8 @@ private:
>  *    void atomParenthesesEnd();
>  *    void atomBackReference(unsigned subpatternId);
>  *    void atomNamedBackReference(String subpatternName);
>+ *    bool isValidNamedForwardReference(String subpatternName);
>+ *    void atomNamedForwardReference(String subpatternName);
>  *
>  *    void quantifyAtom(unsigned min, unsigned max, bool greedy);
>  *
>Index: Source/JavaScriptCore/yarr/YarrPattern.cpp
>===================================================================
>--- Source/JavaScriptCore/yarr/YarrPattern.cpp	(revision 235763)
>+++ Source/JavaScriptCore/yarr/YarrPattern.cpp	(working copy)
>@@ -446,9 +446,9 @@ public:
>     {
>     }
> 
>-    void reset()
>+    void resetForReparsing()
>     {
>-        m_pattern.reset();
>+        m_pattern.resetForReparsing();
>         m_characterClassConstructor.reset();
> 
>         auto body = std::make_unique<PatternDisjunction>();
>@@ -456,7 +456,17 @@ public:
>         m_alternative = body->addNewAlternative();
>         m_pattern.m_disjunctions.append(WTFMove(body));
>     }
>-    
>+
>+    void saveUnmatchedNamedForwardReferences()
>+    {
>+        m_invalidNamedForwardReferences.shrink(0);
>+        
>+        for (auto it = m_pattern.m_namedForwardReferences.begin(), itEnd = m_pattern.m_namedForwardReferences.end(); it < itEnd; ++it) {
>+            if (!m_pattern.m_captureGroupNames.contains(*it))
>+                m_invalidNamedForwardReferences.append(*it);
>+        }
>+    }
>+
>     void assertionBOL()
>     {
>         if (!m_alternative->m_terms.size() && !m_invertParentheticalAssertion) {
>@@ -672,6 +682,20 @@ public:
>         atomBackReference(m_pattern.m_namedGroupToParenIndex.get(subpatternName));
>     }
> 
>+    bool isValidNamedForwardReference(String subpatternName)
>+    {
>+        if (!m_invalidNamedForwardReferences.find(subpatternName))
>+            return false;
>+
>+        return true;
>+    }
>+
>+    void atomNamedForwardReference(String subpatternName)
>+    {
>+        m_pattern.m_namedForwardReferences.appendIfNotContains(subpatternName);
>+        m_alternative->m_terms.append(PatternTerm::ForwardReference());
>+    }
>+    
>     // deep copy the argument disjunction.  If filterStartsWithBOL is true,
>     // skip alternatives with m_startsWithBOL set true.
>     PatternDisjunction* copyDisjunction(PatternDisjunction* disjunction, bool filterStartsWithBOL = false)
>@@ -1080,6 +1104,7 @@ private:
>     YarrPattern& m_pattern;
>     PatternAlternative* m_alternative;
>     CharacterClassConstructor m_characterClassConstructor;
>+    Vector<String> m_invalidNamedForwardReferences;
>     void* m_stackLimit;
>     bool m_invertCharacterClass;
>     bool m_invertParentheticalAssertion { false };
>@@ -1102,13 +1127,14 @@ ErrorCode YarrPattern::compile(const Str
>     // Quoting Netscape's "What's new in JavaScript 1.2",
>     //      "Note: if the number of left parentheses is less than the number specified
>     //       in \#, the \# is taken as an octal escape as described in the next row."
>-    if (containsIllegalBackReference()) {
>+    if (containsIllegalBackReference() || containsIllegalNamedForwardReferences()) {
>         if (unicode())
>             return ErrorCode::InvalidBackreference;
> 
>         unsigned numSubpatterns = m_numSubpatterns;
> 
>-        constructor.reset();
>+        constructor.saveUnmatchedNamedForwardReferences();
>+        constructor.resetForReparsing();
>         ErrorCode error = parse(constructor, patternString, unicode(), numSubpatterns);
>         ASSERT_UNUSED(error, !hasError(error));
>         ASSERT(numSubpatterns == m_numSubpatterns);
>@@ -1139,6 +1165,7 @@ YarrPattern::YarrPattern(const String& p
>     , m_flags(flags)
> {
>     error = compile(pattern, stackLimit);
>+    //  &&&&
> }
> 
> void indentForNestingLevel(PrintStream& out, unsigned nestingDepth)
>Index: Source/JavaScriptCore/yarr/YarrPattern.h
>===================================================================
>--- Source/JavaScriptCore/yarr/YarrPattern.h	(revision 235763)
>+++ Source/JavaScriptCore/yarr/YarrPattern.h	(working copy)
>@@ -354,7 +354,7 @@ struct TermChain {
> struct YarrPattern {
>     JS_EXPORT_PRIVATE YarrPattern(const String& pattern, RegExpFlags, ErrorCode&, void* stackLimit = nullptr);
> 
>-    void reset()
>+    void resetForReparsing()
>     {
>         m_numSubpatterns = 0;
>         m_maxBackReference = 0;
>@@ -381,12 +381,28 @@ struct YarrPattern {
>         m_disjunctions.clear();
>         m_userCharacterClasses.clear();
>         m_captureGroupNames.shrink(0);
>+        m_namedForwardReferences.shrink(0);
>     }
> 
>     bool containsIllegalBackReference()
>     {
>         return m_maxBackReference > m_numSubpatterns;
>     }
>+    
>+    bool containsIllegalNamedForwardReferences()
>+    {
>+        if (m_namedForwardReferences.isEmpty())
>+            return false;
>+
>+        bool result = false;
>+
>+        for (auto it = m_namedForwardReferences.begin(), itEnd = m_namedForwardReferences.end(); it < itEnd; ++it) {
>+            if (!m_captureGroupNames.contains(*it))
>+                result = true;
>+        }
>+
>+        return result;
>+    }
> 
>     bool containsUnsignedLengthPattern()
>     {
>@@ -513,6 +529,7 @@ struct YarrPattern {
>     Vector<std::unique_ptr<PatternDisjunction>, 4> m_disjunctions;
>     Vector<std::unique_ptr<CharacterClass>> m_userCharacterClasses;
>     Vector<String> m_captureGroupNames;
>+    Vector<String> m_namedForwardReferences;
>     HashMap<String, unsigned> m_namedGroupToParenIndex;
> 
> private:
>Index: Source/JavaScriptCore/yarr/YarrSyntaxChecker.cpp
>===================================================================
>--- Source/JavaScriptCore/yarr/YarrSyntaxChecker.cpp	(revision 235763)
>+++ Source/JavaScriptCore/yarr/YarrSyntaxChecker.cpp	(working copy)
>@@ -49,6 +49,8 @@ public:
>     void atomParenthesesEnd() {}
>     void atomBackReference(unsigned) {}
>     void atomNamedBackReference(String) {}
>+    bool isValidNamedForwardReference(String) { return true; }
>+    void atomNamedForwardReference(String) {}
>     void quantifyAtom(unsigned, unsigned, bool) {}
>     void disjunction() {}
> };
>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 235763)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,21 @@
>+2018-09-07  Michael Saboff  <msaboff@apple.com>
>+
>+        Test262 failure with Named Capture Groups - using a reference before the group is defined
>+        https://bugs.webkit.org/show_bug.cgi?id=189407
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Created new delegate stubs for RegExp parsing.  These are not needed for the URL
>+        filtering use cases.
>+
>+        No new tests, no functionality changed.
>+
>+        * contentextensions/URLFilterParser.cpp:
>+        (WebCore::ContentExtensions::PatternParser::isValidNamedForwardReference):
>+        (WebCore::ContentExtensions::PatternParser::atomNamedForwardReference):
>+        (WebCore::ContentExtensions::URLFilterParser::statusString):
>+        * contentextensions/URLFilterParser.h:
>+
> 2018-09-06  Zalan Bujtas  <zalan@apple.com>
> 
>         [LFC][BFC] Add support for min(max)-height
>Index: Source/WebCore/contentextensions/URLFilterParser.cpp
>===================================================================
>--- Source/WebCore/contentextensions/URLFilterParser.cpp	(revision 235763)
>+++ Source/WebCore/contentextensions/URLFilterParser.cpp	(working copy)
>@@ -134,6 +134,16 @@ public:
>         fail(URLFilterParser::BackReference);
>     }
> 
>+    bool isValidNamedForwardReference(String)
>+    {
>+        return true;
>+    }
>+
>+    void atomNamedForwardReference(String)
>+    {
>+        fail(URLFilterParser::ForwardReference);
>+    }
>+    
>     void assertionBOL()
>     {
>         if (hasError())
>@@ -372,6 +382,8 @@ String URLFilterParser::statusString(Par
>         return "Character class is not supported.";
>     case BackReference:
>         return "Patterns cannot contain backreferences.";
>+    case ForwardReference:
>+        return "Patterns cannot contain forward references.";
>     case MisplacedStartOfLine:
>         return "Start of line assertion can only appear as the first term in a filter.";
>     case WordBoundary:
>Index: Source/WebCore/contentextensions/URLFilterParser.h
>===================================================================
>--- Source/WebCore/contentextensions/URLFilterParser.h	(revision 235763)
>+++ Source/WebCore/contentextensions/URLFilterParser.h	(working copy)
>@@ -43,6 +43,7 @@ public:
>         NonASCII,
>         UnsupportedCharacterClass,
>         BackReference,
>+        ForwardReference,
>         MisplacedStartOfLine,
>         WordBoundary,
>         AtomCharacter,
>Index: LayoutTests/ChangeLog
>===================================================================
>--- LayoutTests/ChangeLog	(revision 235763)
>+++ LayoutTests/ChangeLog	(working copy)
>@@ -1,3 +1,15 @@
>+2018-09-07  Michael Saboff  <msaboff@apple.com>
>+
>+        Test262 failure with Named Capture Groups - using a reference before the group is defined
>+        https://bugs.webkit.org/show_bug.cgi?id=189407
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Updated tests.
>+
>+        * js/regexp-named-capture-groups-expected.txt:
>+        * js/script-tests/regexp-named-capture-groups.js:
>+
> 2018-09-06  Zalan Bujtas  <zalan@apple.com>
> 
>         [LFC][BFC] Add support for min(max)-height
>Index: LayoutTests/js/regexp-named-capture-groups-expected.txt
>===================================================================
>--- LayoutTests/js/regexp-named-capture-groups-expected.txt	(revision 235763)
>+++ LayoutTests/js/regexp-named-capture-groups-expected.txt	(working copy)
>@@ -61,6 +61,12 @@ PASS let r = new RegExp("/(?<ðgroupNa
> PASS let r = new RegExp("/(?<gðoupName1>abc)/u") threw exception SyntaxError: Invalid regular expression: invalid group specifier name.
> PASS let r = new RegExp("/(?<âgroupName1>abc)/u") threw exception SyntaxError: Invalid regular expression: invalid group specifier name.
> PASS let r = new RegExp("/(?<âgroupName1>abc)/u") threw exception SyntaxError: Invalid regular expression: invalid group specifier name.
>+PASS "XzzXzz".match(/\k<z>X(?<z>z*)X\k<z>/) is ["XzzXzz", "zz"]
>+PASS "XzzXzz".match(/\k<z>X(?<z>z*)X\k<z>/u) is ["XzzXzz", "zz"]
>+PASS "1122332211".match(/\k<ones>\k<twos>\k<threes>(?<ones>1*)(?<twos>2*)(?<threes>3*)\k<threes>\k<twos>\k<ones>/) is ["1122332211", "11", "22", "3"]
>+PASS "1122332211".match(/\k<ones>\k<twos>\k<threes>(?<ones>1*)(?<twos>2*)(?<threes>3*)\k<threes>\k<twos>\k<ones>/u) is ["1122332211", "11", "22", "3"]
>+PASS "\k<z>XzzX".match(/\k<z>X(z*)X/) is ["k<z>XzzX", "zz"]
>+PASS "\k<z>XzzX".match(/\k<z>X(z*)X/u) threw exception SyntaxError: Invalid regular expression: invalid backreference for unicode pattern.
> PASS successfullyParsed is true
> 
> TEST COMPLETE
>Index: LayoutTests/js/script-tests/regexp-named-capture-groups.js
>===================================================================
>--- LayoutTests/js/script-tests/regexp-named-capture-groups.js	(revision 235763)
>+++ LayoutTests/js/script-tests/regexp-named-capture-groups.js	(working copy)
>@@ -104,3 +104,13 @@ shouldThrow('let r = new RegExp("/(?<g\u
> shouldThrow('let r = new RegExp("/(?<\u200cgroupName1>abc)/u")', '"SyntaxError: Invalid regular expression: invalid group specifier name"');
> shouldThrow('let r = new RegExp("/(?<\u200dgroupName1>abc)/u")', '"SyntaxError: Invalid regular expression: invalid group specifier name"');
> 
>+// Check the named forward references work
>+shouldBe('"XzzXzz".match(/\\\k<z>X(?<z>z*)X\\\k<z>/)', '["XzzXzz", "zz"]');
>+shouldBe('"XzzXzz".match(/\\\k<z>X(?<z>z*)X\\\k<z>/u)', '["XzzXzz", "zz"]');
>+shouldBe('"1122332211".match(/\\\k<ones>\\\k<twos>\\\k<threes>(?<ones>1*)(?<twos>2*)(?<threes>3*)\\\k<threes>\\\k<twos>\\\k<ones>/)', '["1122332211", "11", "22", "3"]');
>+shouldBe('"1122332211".match(/\\\k<ones>\\\k<twos>\\\k<threes>(?<ones>1*)(?<twos>2*)(?<threes>3*)\\\k<threes>\\\k<twos>\\\k<ones>/u)', '["1122332211", "11", "22", "3"]');
>+
>+// Check that a named forward reference for a non-existent named capture
>+// matches for non-unicode patterns and throws for unicode patterns.
>+shouldBe('"\\\k<z>XzzX".match(/\\\k<z>X(z*)X/)', '["k<z>XzzX", "zz"]');
>+shouldThrow('"\\\k<z>XzzX".match(/\\\k<z>X(z*)X/u)', '"SyntaxError: Invalid regular expression: invalid backreference for unicode pattern"');

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Attachments on bug 189407: 349187 | 349212 | 349355