process backslash string escapes in regexp pattern and regexprep replacement (bug #35911) * regexp.cc (do_regexp_string_escapes): New function. (octregexp, octregexprep): Process backslash string escapes in single-quoted pattern string. (octregexprep): Process backslash string escapes in single-quoted replacement string.

#include <octave/oct.h>

DEFUN_DLD (helloworld, args, nargout,
  "Hello World Help String")
{
  int nargin = args.length ();
  octave_stdout << "Hello World has " << nargin
        << " input arguments and "
        << nargout << " output arguments.\n";
  return octave_value_list ();
}