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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def modify(self, current_modified_line, anchors, file_path, file_lines=None, index=None):
 """ Replace all AnchorHub tag-using inline links in this line and edit them to use :param current_modified_line: string representing the the line at file_lines[index] _after_ any previous modifications from other WriterStrategy objects: :param anchors: Dictionary mapping string file paths to inner dictionaries. These inner dictionaries map string AnchorHub tags to string generated anchor :param file_path: string representing the file_path of the current file being examined by this WriterStrategy :param file_lines: List of strings corresponding to lines in a text file :param index: index of file_lines corresponding to the current line :return: string. current_modified_line with all inline links that use AnchorHub tags replaced with their associated generated anchors """

        changed_line = ""  # Will be built up piece by piece as we find links
        links = self._get_link_indices(current_modified_line)

        # Used to keep track of what we've parsed in current_modified_line
        last_index = 0

        for link in links:
            # These indices are relative to current_modified_line
            link_start_index = link[0]  # Start index in current_modified_line
            link_end_index = link[1]  # End index in current_modified_line
            link_text = current_modified_line[link_start_index:link_end_index]

            # This index is relative to link_text
            url_start = self._link_start_regex.search(link_text).end()
            url_text = link_text[url_start:len(link_text) - 1].strip()

            # This index is relative to url_text
            hash_index = url_text.find('#')  # index of '#' in url_text

            link_path = url_text[:hash_index]
            tag = url_text[hash_index + 1:]

            if link_path == "":
                # Link points to tag in this file
                file_key = file_path
            else:
                file_key = self._get_file_key(file_path, link_path)

            if self._file_has_tag_anchor_keypair(anchors, file_key, tag):
                # The tag used on this link was specified as an AnchorHub tag
                # Add existing text up to (and including) the # mark
                changed_line += current_modified_line[last_index:
                                                      link_start_index +
                                                      url_start + hash_index+1]
                # Add the the generated anchor, plus a closing parenthesis
                changed_line += anchors[file_key][tag] + ')'
            else:
                # The tag used is a normal anchor tag: don't change it
                changed_line += current_modified_line[last_index:link_end_index]
            last_index = link_end_index
        # Add the end of the line back on
        changed_line += current_modified_line[last_index:]
        return changed_line