1 files changed, 81 insertions, 0 deletions
diff --git a/absl/strings/match.h b/absl/strings/match.h
new file mode 100644
index 000000000000..4a5d1c0342cd
--- /dev/null
+++ b/absl/strings/match.h
@@ -0,0 +1,81 @@
+//
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: match.h
+// -----------------------------------------------------------------------------
+//
+// This file contains simple utilities for performing std::string matching checks.
+// All of these function parameters are specified as `absl::string_view`,
+// meaning that these functions can accept `std::string`, `absl::string_view` or
+// nul-terminated C-style strings.
+//
+// Examples:
+//   std::string s = "foo";
+//   absl::string_view sv = "f";
+//   EXPECT_TRUE(absl::StrContains(s, sv));
+//
+// Note: The order of parameters in these functions is designed to mimic the
+// order an equivalent member function would exhibit;
+// e.g. `s.Contains(x)` ==> `absl::StrContains(s, x).
+#ifndef ABSL_STRINGS_MATCH_H_
+#define ABSL_STRINGS_MATCH_H_
+
+#include <cstring>
+
+#include "absl/strings/string_view.h"
+
+namespace absl {
+
+// StrContains()
+//
+// Returns whether a given std::string `s` contains the substring `x`.
+inline bool StrContains(absl::string_view s, absl::string_view x) {
+  return static_cast<absl::string_view::size_type>(s.find(x, 0)) != s.npos;
+}
+
+// StartsWith()
+//
+// Returns whether a given std::string `s` begins with `x`.
+inline bool StartsWith(absl::string_view s, absl::string_view x) {
+  return x.empty() ||
+         (s.size() >= x.size() && memcmp(s.data(), x.data(), x.size()) == 0);
+}
+
+// EndsWith()
+//
+// Returns whether a given std::string `s` ends `x`.
+inline bool EndsWith(absl::string_view s, absl::string_view x) {
+  return x.empty() ||
+         (s.size() >= x.size() &&
+          memcmp(s.data() + (s.size() - x.size()), x.data(), x.size()) == 0);
+}
+
+// StartsWithIgnoreCase()
+//
+// Returns whether a given std::string `text` starts with `starts_with`, ignoring
+// case in the comparison.
+bool StartsWithIgnoreCase(absl::string_view text,
+                          absl::string_view starts_with);
+
+// EndsWithIgnoreCase()
+//
+// Returns whether a given std::string `text` ends with `ends_with`, ignoring case
+// in the comparison.
+bool EndsWithIgnoreCase(absl::string_view text, absl::string_view ends_with);
+
+}  // namespace absl
+
+#endif  // ABSL_STRINGS_MATCH_H_