Copy the name of the subfolders in all the html files located in all the subfolders

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EXPLANATION:

ROMANIAN:  https://neculaifantanaru.com/python-copiaza-automat-denumirea-subfolderelor-in-toate-fisierele-html-aflate-in-toate-subfolderele.html

ENGLISH:
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import requests
import re
import os
import regex

# folder principal
folder_principal = "e:\\FLAGS"
extension_file = ".html"

def read_text_from_file(file_path):
    """
    Aceasta functie returneaza continutul unui fisier.
    file_path: calea catre fisierul din care vrei sa citesti
    """
    with open(file_path, encoding='utf8') as f:
        text = f.read()
        f.close()
        return text


def write_to_file(text, file_path):
    """
    Aceasta functie scrie un text intr-un fisier.
    text: textul pe care vrei sa il scrii
    file_path: calea catre fisierul in care vrei sa scrii
    """
    with open(file_path, 'wb') as f:
        f.write(text.encode('utf8', 'ignore'))
        f.close()

for root, dirs, files in os.walk(folder_principal): # folder principal
    for d in dirs: # subfoldere
        cale_subfolder = root + os.sep + d
        for root_files, dirs_files, files_files in os.walk(cale_subfolder): # fisiere din subfoldere
            for file_name in files_files:
                file_path = root_files + os.sep + file_name
                file_content = read_text_from_file(file_path)

                # <meta http-equiv="Content-Language" content="en"/>
                meta_lang = re.search('<meta http-equiv="Content-Language" content=".*?".*?/>', file_content)
                if (meta_lang == None):
                    print("Nu am gasit --- en --- in fisierul --- {} ---.".format(file_path))
                else:
                    meta_lang = meta_lang[0]
                    new_meta_lang = re.sub(r'content=".+"', f'content="{d.lower()}"', meta_lang)
                    file_content = file_content.replace(meta_lang, new_meta_lang)

                # <meta property="og:locale" content="en"/>
                meta_prop_lang = re.search('<meta property="og:locale" content=".*?".*?/>', file_content)
                if (meta_prop_lang == None):
                    print("Nu am gasit --- en --- in fisierul --- {} ---.".format(file_path))
                else:
                    meta_prop_lang = meta_prop_lang[0]
                    new_meta_prop_lang = re.sub(r'content=".+"', f'content="{d.lower()}"', meta_prop_lang)
                    file_content = file_content.replace(meta_prop_lang, new_meta_prop_lang)

                # https://neculaifantanaru.com/en/
                link_lang_regex = re.compile('https://neculaifantanaru.com/en/')
                link_lang = re.findall(link_lang_regex, file_content)
                if (len(link_lang) == 0):
                    print("Nu am gasit --- neculaifantanaru.com/en/ --- in fisierul --- {} ---.".format(file_path))
                else:
                    for i in range(len(link_lang)):
                        link_lang_i = link_lang[i]
                        new_link_lang_i = re.sub('https://neculaifantanaru.com/en/', f'https://neculaifantanaru.com/{d.lower()}/', link_lang_i)
                        file_content = file_content.replace(link_lang_i, new_link_lang_i)

                # alt="fr" width="28" height="19" /></a>&nbsp; <a href="https://neculaifantanaru.com/af/
                flags_content = re.search("<!-- FLAGS_1 -->[\s\S]*?<!-- FLAGS -->", file_content)
                if (flags_content == None):
                    print("Nu am gasit --- FLAGS --- in fisierul --- {} ---.".format(file_path))
                else:
                    flags_content = flags_content[0]
                    new_flags_content = flags_content
                    links_flags_regex = re.compile('alt="fr" width="28" height="19" /></a>&nbsp; <a href="https://neculaifantanaru.com/.*?/')
                    links_flags = re.findall(links_flags_regex, flags_content)

                    if (len(links_flags) == 0):
                        print("Nu am gasit --- links FLAGS --- in fisierul --- {} ---.".format(file_path))
                    else:
                        for i in range(len(links_flags)):
                            link_i = links_flags[i]
                            new_link_i = re.sub('https://neculaifantanaru.com/.*?/', 'https://neculaifantanaru.com/en/', link_i)
                            new_flags_content = new_flags_content.replace(link_i, new_link_i)
                        file_content = file_content.replace(flags_content, new_flags_content)

                # REGEX_1   \x20\|.*(</title>) -> \1
                title = re.search('\x20\|.*(</title>)', file_content)
                if (title == None):
                    print("Nu am gasit --- title --- in fisierul --- {} ---.".format(file_path))
                else:
                    file_content = re.sub(r'\x20\|.*(</title>)', r'\1', file_content)

                # REGEX_2  <td width="149"><div class="rw-ui-container rw-class[\s\S]*?</td>
                file_content = re.sub(r'<td width="149"><div class="rw-ui-container rw-class[\s\S]*?</td>', '', file_content)

                # REGEX_3  \A(?s).*?<!DOCTYPE html>(?-s).*\R -> \r<!DOCTYPE html>\r
                file_content = regex.sub(r'[\s\S]*?<\?php[\s\S]*?\?>\s+', r'', file_content)

                write_to_file(file_content, file_path)