"child_basename_matchregexp_file"

    $class->child_basename_matchregexp_file( $result_object, $regexp );

Given a regexp $regexp, match if any of "$result_object->path->children" match the given regexp, on the condition that those that match are also files.

    if ( $self->child_basename_matchregexp_file( $result_object, qr/^Change(.*)$/i ) ) {
        # result_object->path() contains at least one child that is a file and matches the regexp
    }

"_this_child_isfile"

    if ( $class->_this_child_isfile( $result_object, $child_path ) ) {
        ...
    }