Replace RE2 import with a dependency

third_party/re2/re2/testing/mimics_pcre_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.
-
-#include "util/test.h"
-#include "re2/prog.h"
-#include "re2/regexp.h"
-
-namespace re2 {
-
-struct PCRETest {
-  const char* regexp;
-  bool should_match;
-};
-
-static PCRETest tests[] = {
-  // Most things should behave exactly.
-  { "abc",       true  },
-  { "(a|b)c",    true  },
-  { "(a*|b)c",   true  },
-  { "(a|b*)c",   true  },
-  { "a(b|c)d",   true  },
-  { "a(()|())c", true  },
-  { "ab*c",      true  },
-  { "ab+c",      true  },
-  { "a(b*|c*)d", true  },
-  { "\\W",       true  },
-  { "\\W{1,2}",  true  },
-  { "\\d",       true  },
-
-  // Check that repeated empty strings do not.
-  { "(a*)*",     false },
-  { "x(a*)*y",   false },
-  { "(a*)+",     false },
-  { "(a+)*",     true  },
-  { "(a+)+",     true  },
-  { "(a+)+",     true  },
-
-  // \v is the only character class that shouldn't.
-  { "\\b",       true  },
-  { "\\v",       false },
-  { "\\d",       true  },
-
-  // The handling of ^ in multi-line mode is different, as is
-  // the handling of $ in single-line mode.  (Both involve
-  // boundary cases if the string ends with \n.)
-  { "\\A",       true  },
-  { "\\z",       true  },
-  { "(?m)^",     false },
-  { "(?m)$",     true  },
-  { "(?-m)^",    true  },
-  { "(?-m)$",    false },  // In PCRE, == \Z
-  { "(?m)\\A",   true  },
-  { "(?m)\\z",   true  },
-  { "(?-m)\\A",  true  },
-  { "(?-m)\\z",  true  },
-};
-
-TEST(MimicsPCRE, SimpleTests) {
-  for (int i = 0; i < arraysize(tests); i++) {
-    const PCRETest& t = tests[i];
-    for (int j = 0; j < 2; j++) {
-      Regexp::ParseFlags flags = Regexp::LikePerl;
-      if (j == 0)
-        flags = flags | Regexp::Latin1;
-      Regexp* re = Regexp::Parse(t.regexp, flags, NULL);
-      CHECK(re) << " " << t.regexp;
-      CHECK_EQ(t.should_match, re->MimicsPCRE())
-        << " " << t.regexp << " "
-        << (j==0 ? "latin1" : "utf");
-      re->Decref();
-    }
-  }
-}
-
-}  // namespace re2