// engine uses re2, which accepts a subset of PCRE. See
  // https://github.com/google/re2/wiki/Syntax for details.
  string regex = 1;
}

// Matcher specification for identifying quantizable units.
message MatcherSpec {
  // Matches lifted functions by their names.
  FunctionNameMatcherSpec function_name = 1;
}

// Specifies how to quantize matched quantizable units.
message Method {
  oneof method {