Replace RE2 import with a dependency

third_party/re2/re2/testing/exhaustive_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/testing/exhaustive_tester.h"
-
-namespace re2 {
-
-DECLARE_string(regexp_engines);
-
-// Test very simple expressions.
-TEST(EgrepLiterals, Lowercase) {
-  EgrepTest(3, 2, "abc.", 3, "abc", "");
-}
-
-// Test mixed-case expressions.
-TEST(EgrepLiterals, MixedCase) {
-  EgrepTest(3, 2, "AaBb.", 2, "AaBb", "");
-}
-
-// Test mixed-case in case-insensitive mode.
-TEST(EgrepLiterals, FoldCase) {
-  // The punctuation characters surround A-Z and a-z
-  // in the ASCII table.  This looks for bugs in the
-  // bytemap range code in the DFA.
-  EgrepTest(3, 2, "abAB.", 2, "aBc@_~", "(?i:%s)");
-}
-
-// Test very simple expressions.
-TEST(EgrepLiterals, UTF8) {
-  EgrepTest(3, 2, "ab.", 4, "a\xE2\x98\xBA", "");
-}
-
-}  // namespace re2
-