//
//===----------------------------------------------------------------------===//
//
-// This file implements a POSIX regular expression matcher.
+// This file implements a POSIX regular expression matcher. Both Basic and
+// Extended POSIX regular expressions (ERE) are supported. EREs were extended
+// to support backreferences in matches.
+// This implementation also supports matching strings with embedded NUL chars.
//
//===----------------------------------------------------------------------===//
/// null string after any newline in the string in addition to its normal
/// function, and the $ anchor matches the null string before any
/// newline in the string in addition to its normal function.
- Newline=2
+ Newline=2,
+ /// By default, the POSIX extended regular expression (ERE) syntax is
+ /// assumed. Pass this flag to turn on basic regular expressions (BRE)
+ /// instead.
+ BasicRegex=4
};
- /// Compiles the given POSIX Extended Regular Expression \p Regex.
- /// This implementation supports regexes and matching strings with embedded
- /// NUL characters.
+ /// Compiles the given regular expression \p Regex.
Regex(StringRef Regex, unsigned Flags = NoFlags);
+ Regex(const Regex &) = delete;
+ Regex &operator=(Regex regex) {
+ std::swap(preg, regex.preg);
+ std::swap(error, regex.error);
+ return *this;
+ }
+ Regex(Regex &®ex) {
+ preg = regex.preg;
+ error = regex.error;
+ regex.preg = nullptr;
+ }
~Regex();
/// isValid - returns the error encountered during regex compilation, or
/// the first group is always the entire pattern.
///
/// This returns true on a successful match.
- bool match(StringRef String, SmallVectorImpl<StringRef> *Matches = 0);
+ bool match(StringRef String, SmallVectorImpl<StringRef> *Matches = nullptr);
/// sub - Return the result of replacing the first match of the regex in
/// \p String with the \p Repl string. Backreferences like "\0" in the
/// \param Error If non-null, any errors in the substitution (invalid
/// backreferences, trailing backslashes) will be recorded as a non-empty
/// string.
- std::string sub(StringRef Repl, StringRef String, std::string *Error = 0);
+ std::string sub(StringRef Repl, StringRef String,
+ std::string *Error = nullptr);
+
+ /// \brief If this function returns true, ^Str$ is an extended regular
+ /// expression that matches Str and only Str.
+ static bool isLiteralERE(StringRef Str);
+
+ /// \brief Turn String into a regex by escaping its special characters.
+ static std::string escape(StringRef String);
private:
struct llvm_regex *preg;