Replace RE2 import with a dependency

third_party/re2/re2/testing/exhaustive2_test.cc

-// Copyright 2008 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Exhaustive testing of regular expression matching.
-
-#include "util/test.h"
-#include "re2/re2.h"
-#include "re2/testing/exhaustive_tester.h"
-
-DECLARE_string(regexp_engines);
-
-namespace re2 {
-
-// Test empty string matches (aka "(?:)")
-TEST(EmptyString, Exhaustive) {
-  ExhaustiveTest(2, 2, Split(" ", "(?:) a"),
-                 RegexpGenerator::EgrepOps(),
-                 5, Split("", "ab"), "", "");
-}
-
-// Test escaped versions of regexp syntax.
-TEST(Punctuation, Literals) {
-  vector<string> alphabet = Explode("()*+?{}[]\\^$.");
-  vector<string> escaped = alphabet;
-  for (size_t i = 0; i < escaped.size(); i++)
-    escaped[i] = "\\" + escaped[i];
-  ExhaustiveTest(1, 1, escaped, RegexpGenerator::EgrepOps(),
-                 2, alphabet, "", "");
-}
-
-// Test ^ $ . \A \z in presence of line endings.
-// Have to wrap the empty-width ones in (?:) so that
-// they can be repeated -- PCRE rejects ^* but allows (?:^)*
-TEST(LineEnds, Exhaustive) {
-  ExhaustiveTest(2, 2, Split(" ", "(?:^) (?:$) . a \\n (?:\\A) (?:\\z)"),
-                 RegexpGenerator::EgrepOps(),
-                 4, Explode("ab\n"), "", "");
-}
-
-// Test what does and does not match \n.
-// This would be a good test, except that PCRE seems to have a bug:
-// in single-byte character set mode (the default),
-// [^a] matches \n, but in UTF-8 mode it does not.
-// So when we run the test, the tester complains that
-// we don't agree with PCRE, but it's PCRE that is at fault.
-// For what it's worth, Perl gets this right (matches
-// regardless of whether UTF-8 input is selected):
-//
-//     #!/usr/bin/perl
-//     use POSIX qw(locale_h);
-//     print "matches in latin1\n" if "\n" =~ /[^a]/;
-//     setlocale("en_US.utf8");
-//     print "matches in utf8\n" if "\n" =~ /[^a]/;
-//
-// The rule chosen for RE2 is that by default, like Perl,
-// dot does not match \n but negated character classes [^a] do.
-// (?s) will allow dot to match \n; there is no way in RE2
-// to stop [^a] from matching \n, though the underlying library
-// provides a mechanism, and RE2 could add new syntax if needed.
-//
-// TEST(Newlines, Exhaustive) {
-//   vector<string> empty_vector;
-//   ExhaustiveTest(1, 1, Split(" ", "\\n . a [^a]"),
-//                  RegexpGenerator::EgrepOps(),
-//                  4, Explode("a\n"), "");
-// }
-
-}  // namespace re2
-