Masud_Sir/validate_identifier_with_regex.ipynb

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    "import re\n",
    "\n",
    "def is_valid_identifier(identifier):\n",
    "    # Check if the identifier starts with a letter or underscore\n",
    "    if not re.match(r'^[a-zA-Z_]', identifier):\n",
    "        return False\n",
    "\n",
    "    # Check if the remaining characters are letters, digits, or underscores\n",
    "    if not re.match(r'^[a-zA-Z0-9_]*$', identifier):\n",
    "        return False\n",
    "\n",
    "    # Check if the identifier is a reserved word for python \n",
    "    reserved_words = set(['if', 'else', 'while', 'for', 'int', 'float', 'return', 'def', 'class', 'import', 'from'])\n",
    "    if identifier in reserved_words:\n",
    "        return False\n",
    "    \n",
    "    # Check if the identifier is a reserved word for c++\n",
    "    reserved_words_c_and_cpp = set([\n",
    "        'auto', 'break', 'case', 'char', 'const', 'continue', 'default', 'do', 'double', 'else', \n",
    "        'enum', 'extern', 'float', 'for', 'goto', 'if', 'int', 'long', 'register', 'return', \n",
    "        'short', 'signed', 'sizeof', 'static', 'struct', 'switch', 'typedef', 'union', 'unsigned', \n",
    "        'void', 'volatile', 'while',\n",
    "        \n",
    "        # Additional keywords in C++\n",
    "        'bool', 'class', 'const_cast', 'delete', 'dynamic_cast', 'explicit', 'export', 'false', \n",
    "        'friend', 'inline', 'mutable', 'namespace', 'new', 'operator', 'private', 'protected', \n",
    "        'public', 'reinterpret_cast', 'static_cast', 'template', 'this', 'throw', 'true', 'try', \n",
    "        'typeid', 'typename', 'using', 'virtual', 'wchar_t'\n",
    "    ])\n",
    "    if identifier in reserved_words_c_and_cpp:\n",
    "        return False\n",
    "\n",
    "\n",
    "    return True\n",
    "\n",
    "if __name__ == \"__main__\":\n",
    "    user_input = input(\"Enter an identifier(For python or C/C++): \")\n",
    "\n",
    "    if is_valid_identifier(user_input):\n",
    "        print(f\"The identifier '{user_input}' is valid.\")\n",
    "    else:\n",
    "        print(f\"The identifier '{user_input}' is not valid.\")\n"
   ]
  }
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