Revert of Experimental support for RegExp lookbehind.

test/mjsunit/harmony/regexp-lookbehind.js

Index: test/mjsunit/harmony/regexp-lookbehind.js
diff --git a/test/mjsunit/harmony/regexp-lookbehind.js b/test/mjsunit/harmony/regexp-lookbehind.js
deleted file mode 100644
index 362ac4d9b4f4f5fbeea18374f1807eec745d29ed..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/regexp-lookbehind.js
+++ /dev/null
@@ -1,159 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-regexp-lookbehind
-
-// Simple fixed-length matches.
-assertEquals(["a"], "a".match(/^.(?<=a)/));
-assertNull("b".match(/^.(?<=a)/));
-assertEquals(["foo"], "foo1".match(/^f..(?<=.oo)/));
-assertEquals(["foo"], "foo2".match(/^f\w\w(?<=\woo)/));
-assertNull("boo".match(/^f\w\w(?<=\woo)/));
-assertNull("fao".match(/^f\w\w(?<=\woo)/));
-assertNull("foa".match(/^f\w\w(?<=\woo)/));
-assertEquals(["def"], "abcdef".match(/(?<=abc)\w\w\w/));
-assertEquals(["def"], "abcdef".match(/(?<=a.c)\w\w\w/));
-assertEquals(["def"], "abcdef".match(/(?<=a\wc)\w\w\w/));
-assertEquals(["cde"], "abcdef".match(/(?<=a[a-z])\w\w\w/));
-assertEquals(["def"], "abcdef".match(/(?<=a[a-z][a-z])\w\w\w/));
-assertEquals(["def"], "abcdef".match(/(?<=a[a-z]{2})\w\w\w/));
-assertEquals(["bcd"], "abcdef".match(/(?<=a{1})\w\w\w/));
-assertEquals(["cde"], "abcdef".match(/(?<=a{1}b{1})\w\w\w/));
-assertEquals(["def"], "abcdef".match(/(?<=a{1}[a-z]{2})\w\w\w/));
-
-// Variable-length matches.
-assertEquals(["def"], "abcdef".match(/(?<=[a|b|c]*)[^a|b|c]{3}/));
-assertEquals(["def"], "abcdef".match(/(?<=\w*)[^a|b|c]{3}/));
-
-// Start of line matches.
-assertEquals(["def"], "abcdef".match(/(?<=^abc)def/));
-assertEquals(["def"], "abcdef".match(/(?<=^[a-c]{3})def/));
-assertEquals(["def"], "xyz\nabcdef".match(/(?<=^[a-c]{3})def/m));
-assertEquals(["ab", "cd", "efg"], "ab\ncd\nefg".match(/(?<=^)\w+/gm));
-assertEquals(["ab", "cd", "efg"], "ab\ncd\nefg".match(/\w+(?<=$)/gm));
-assertEquals(["ab", "cd", "efg"], "ab\ncd\nefg".match(/(?<=^)\w+(?<=$)/gm));
-assertNull("abcdef".match(/(?<=^[^a-c]{3})def/));
-assertNull("foooo".match(/"^foooo(?<=^o+)$/));
-assertNull("foooo".match(/"^foooo(?<=^o*)$/));
-assertEquals(["foo"], "foo".match(/^foo(?<=^fo+)$/));
-assertEquals(["foooo"], "foooo".match(/^foooo(?<=^fo*)/));
-assertEquals(["foo", "f"], "foo".match(/^(f)oo(?<=^\1o+)$/));
-assertEquals(["foo", "f"], "foo".match(/^(f)oo(?<=^\1o+)$/i));
-assertEquals(["foo\u1234", "f"], "foo\u1234".match(/^(f)oo(?<=^\1o+).$/i));
-assertEquals(["def"], "abcdefdef".match(/(?<=^\w+)def/));
-assertEquals(["def", "def"], "abcdefdef".match(/(?<=^\w+)def/g));
-
-// Word boundary matches.
-assertEquals(["def"], "abc def".match(/(?<=\b)[d-f]{3}/));
-assertEquals(["def"], "ab cdef".match(/(?<=\B)\w{3}/));
-assertEquals(["def"], "ab cdef".match(/(?<=\B)(?<=c(?<=\w))\w{3}/));
-assertNull("abcdef".match(/(?<=\b)[d-f]{3}/));
-
-// Negative lookbehind.
-assertEquals(["abc"], "abcdef".match(/(?<!abc)\w\w\w/));
-assertEquals(["abc"], "abcdef".match(/(?<!a.c)\w\w\w/));
-assertEquals(["abc"], "abcdef".match(/(?<!a\wc)\w\w\w/));
-assertEquals(["abc"], "abcdef".match(/(?<!a[a-z])\w\w\w/));
-assertEquals(["abc"], "abcdef".match(/(?<!a[a-z]{2})\w\w\w/));
-assertNull("abcdef".match(/(?<!abc)def/));
-assertNull("abcdef".match(/(?<!a.c)def/));
-assertNull("abcdef".match(/(?<!a\wc)def/));
-assertNull("abcdef".match(/(?<!a[a-z][a-z])def/));
-assertNull("abcdef".match(/(?<!a[a-z]{2})def/));
-assertNull("abcdef".match(/(?<!a{1}b{1})cde/));
-assertNull("abcdef".match(/(?<!a{1}[a-z]{2})def/));
-
-// Capturing matches.
-assertEquals(["def", "c"], "abcdef".match(/(?<=(c))def/));
-assertEquals(["def", "bc"], "abcdef".match(/(?<=(\w{2}))def/));
-assertEquals(["def", "bc", "c"], "abcdef".match(/(?<=(\w(\w)))def/));
-assertEquals(["def", "a"], "abcdef".match(/(?<=(\w){3})def/));
-assertEquals(["d", "bc", undefined], "abcdef".match(/(?<=(bc)|(cd))./));
-assertEquals(["c", "a", undefined],
-             "abcdef".match(/(?<=([ab]{1,2})\D|(abc))\w/));
-assertEquals(["ab", "a", "b"], "abcdef".match(/\D(?<=([ab]+))(\w)/));
-assertEquals(["c", "d"], "abcdef".match(/(?<=b|c)\w/g));
-assertEquals(["cd", "ef"], "abcdef".match(/(?<=[b-e])\w{2}/g));
-
-// Captures inside negative lookbehind. (They never capture.)
-assertEquals(["de", undefined], "abcdef".match(/(?<!(^|[ab]))\w{2}/));
-
-// Nested lookaround.
-assertEquals(["ef"], "abcdef".match(/(?<=ab(?=c)\wd)\w\w/));
-assertEquals(["ef", "bc"], "abcdef".match(/(?<=a(?=([^a]{2})d)\w{3})\w\w/));
-assertEquals(["ef", "bc"],
-             "abcdef".match(/(?<=a(?=([bc]{2}(?<!a{2}))d)\w{3})\w\w/));
-assertNull("abcdef".match(/(?<=a(?=([bc]{2}(?<!a*))d)\w{3})\w\w/));
-assertEquals(["faaa"], "faaao".match(/^faaao?(?<=^f[oa]+(?=o))/));
-
-// Back references.
-assertEquals(["b", "b", "bb"], "abb".match(/(.)(?<=(\1\1))/));
-assertEquals(["B", "B", "bB"], "abB".match(/(.)(?<=(\1\1))/i));
-assertEquals(["aB", "aB", "a"], "aabAaBa".match(/((\w)\w)(?<=\1\2\1)/i));
-assertEquals(["Ba", "Ba", "a"], "aabAaBa".match(/(\w(\w))(?<=\1\2\1)/i));
-assertEquals(["b", "b", "B"], "abaBbAa".match(/(?=(\w))(?<=(\1))./i));
-assertEquals(["foo", "'", "foo"], "  'foo'  ".match(/(?<=(.))(\w+)(?=\1)/));
-assertEquals(["foo", "\"", "foo"], "  \"foo\"  ".match(/(?<=(.))(\w+)(?=\1)/));
-assertNull("  .foo\"  ".match(/(?<=(.))(\w+)(?=\1)/));
-assertNull("ab".match(/(.)(?<=\1\1\1)/));
-assertNull("abb".match(/(.)(?<=\1\1\1)/));
-assertEquals(["b", "b"], "abbb".match(/(.)(?<=\1\1\1)/));
-assertNull("ab".match(/(..)(?<=\1\1\1)/));
-assertNull("abb".match(/(..)(?<=\1\1\1)/));
-assertNull("aabb".match(/(..)(?<=\1\1\1)/));
-assertNull("abab".match(/(..)(?<=\1\1\1)/));
-assertNull("fabxbab".match(/(..)(?<=\1\1\1)/));
-assertNull("faxabab".match(/(..)(?<=\1\1\1)/));
-assertEquals(["ab", "ab"], "fababab".match(/(..)(?<=\1\1\1)/));
-
-// Back references to captures inside the lookbehind.
-assertEquals(["d", "C"], "abcCd".match(/(?<=\1(\w))d/i));
-assertEquals(["d", "x"], "abxxd".match(/(?<=\1([abx]))d/));
-assertEquals(["c", "ab"], "ababc".match(/(?<=\1(\w+))c/));
-assertEquals(["c", "b"], "ababbc".match(/(?<=\1(\w+))c/));
-assertNull("ababdc".match(/(?<=\1(\w+))c/));
-assertEquals(["c", "abab"], "ababc".match(/(?<=(\w+)\1)c/));
-
-// Alternations are tried left to right,
-// and we do not backtrack into a lookbehind.
-assertEquals(["xabcd", "cd", ""], "xabcd".match(/.*(?<=(..|...|....))(.*)/));
-assertEquals(["xabcd", "bcd", ""], "xabcd".match(/.*(?<=(xx|...|....))(.*)/));
-assertEquals(["xxabcd", "bcd", ""], "xxabcd".match(/.*(?<=(xx|...))(.*)/));
-assertEquals(["xxabcd", "xx", "abcd"], "xxabcd".match(/.*(?<=(xx|xxx))(.*)/));
-
-// We do not backtrack into a lookbehind.
-// The lookbehind captures "abc" so that \1 does not match. We do not backtrack
-// to capture only "bc" in the lookbehind.
-assertNull("abcdbc".match(/(?<=([abc]+)).\1/));
-
-// Greedy loop.
-assertEquals(["c", "bbbbbb"], "abbbbbbc".match(/(?<=(b+))c/));
-assertEquals(["c", "b1234"], "ab1234c".match(/(?<=(b\d+))c/));
-assertEquals(["c", "b12b23b34"], "ab12b23b34c".match(/(?<=((?:b\d{2})+))c/));
-
-// Sticky
-var re1 = /(?<=^(\w+))def/g;
-assertEquals(["def", "abc"], re1.exec("abcdefdef"));
-assertEquals(["def", "abcdef"], re1.exec("abcdefdef"));
-var re2 = /\Bdef/g;
-assertEquals(["def"], re2.exec("abcdefdef"));
-assertEquals(["def"], re2.exec("abcdefdef"));
-
-// Misc
-assertNull("abcdef".match(/(?<=$abc)def/));
-assertEquals(["foo"], "foo".match(/^foo(?<=foo)$/));
-assertEquals(["foo"], "foo".match(/^f.o(?<=foo)$/));
-assertNull("fno".match(/^f.o(?<=foo)$/));
-assertNull("foo".match(/^foo(?<!foo)$/));
-assertNull("foo".match(/^f.o(?<!foo)$/));
-assertEquals(["fno"], "fno".match(/^f.o(?<!foo)$/));
-assertEquals(["foooo"], "foooo".match(/^foooo(?<=fo+)$/));
-assertEquals(["foooo"], "foooo".match(/^foooo(?<=fo*)$/));
-assertEquals(["abc", "abc"], /(abc\1)/.exec("abc"));
-assertEquals(["abc", "abc"], /(abc\1)/.exec("abc\u1234"));
-assertEquals(["abc", "abc"], /(abc\1)/i.exec("abc"));
-assertEquals(["abc", "abc"], /(abc\1)/i.exec("abc\u1234"));
-var oob_subject = "abcdefghijklmnabcdefghijklmn".substr(14);
-assertNull(oob_subject.match(/(?=(abcdefghijklmn))(?<=\1)a/i));
-assertNull(oob_subject.match(/(?=(abcdefghijklmn))(?<=\1)a/));