### Godot version

4.1.dev (1becfea37c)

### System information

MacOS 13.3 M1 Pro

### Issue description

When renaming with Batch Rename using invalid character `NodePath` will be updated with the invalid new name.

### Steps to reproduce

1.  open MRP
2. batch rename all nodes except the root from `e` to `%`
3. look at the `NodePath` on the root

### Minimal reproduction project

[test1.zip](https://github.com/godotengine/godot/files/11377324/test1.zip)

RenameDialog *self = (RenameDialog *)p_self;
	String source_file = String::utf8(p_file);
	
	if (self->has_errors || source_file.find("regex") < 0) {
		return;
	}
	String err_str;
	if (p_errorexp && p_errorexp[0]) {
		err_str = String::utf8(p_errorexp);
	} else {
		err_str = String::utf8(p_error);
	}
	self->has_errors = true;
	self->lbl_preview_title->set_text(TTR("Regular Expression Error:"));
	self->lbl_preview->add_theme_color_override("font_color", EditorNode::get_singleton()->get_gui_base()->get_theme_color(SNAME("error_color"), SNAME("Editor")));
	self->lbl_preview->set_text(vformat(TTR("At character %s"), err_str));
}
String RenameDialog::_regex(const String &pattern, const String &subject, const String &replacement) {
	RegEx regex(pattern);
	return regex.sub(subject, replacement, true);
}
String RenameDialog::_postprocess(const String &subject) {