initial commit

include/sedpp/Regex.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <optional>
+#include <regex.h>
+#include <string>
+#include <vector>
+
+#include "sedpp/Options.h"
+
+namespace sedpp {
+
+struct Match {
+  std::vector<regmatch_t> groups;
+};
+
+// Small RAII wrapper for POSIX regex_t.  POSIX regex reports match offsets
+// relative to the searched pointer, so search() rebases groups to the original
+// subject string before returning.
+class Regex {
+public:
+  Regex(const std::string &pattern, const Options &options,
+        bool ignoreCase = false, bool multiline = false);
+  Regex(const Regex &) = delete;
+  Regex &operator=(const Regex &) = delete;
+  Regex(Regex &&other) noexcept;
+  Regex &operator=(Regex &&other) noexcept;
+  ~Regex();
+
+  [[nodiscard]] std::optional<Match> search(const std::string &text,
+                                            std::size_t start = 0) const;
+
+private:
+  regex_t regex_{};
+  bool compiled_ = false;
+};
+
+} // namespace sedpp