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    "```{index} file\n",
    "```\n",
    "\n",
    "(files)=\n",
    "\n",
    "# Files and Text\n",
    "<!-- chapter-intro -->\n",
    "\n",
    "This chapter introduces the core ideas of **Files** and **Text Processing** and prepares you for the sections that follow. We focus on working with real text data after loading it from files. Instead of tiny one-line examples, you will process multi-line content and extract useful information."
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    "<h2>Why this chapter matters</h2>\n",
    "\n",
    "Most software systems process text:\n",
    "\n",
    "- CSV exports\n",
    "- log files\n",
    "- user-entered records\n",
    "- configuration files\n",
    "\n",
    "To handle these reliably, you need repeatable steps:\n",
    "\n",
    "1. normalize text\n",
    "2. split text into pieces\n",
    "3. find and replace safely\n",
    "4. parse structured records"
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    "<h2>Learning goals</h2>\n",
    "\n",
    "By the end of this chapter, you should be able to:\n",
    "\n",
    "- clean text with trimming and casing methods\n",
    "- split lines into tokens and validate fields\n",
    "- perform safe search/replace operations\n",
    "- parse structured text lines into typed values\n",
    "\n",
    "<h2>Chapter flow</h2>\n",
    "\n",
    "```{tableofcontents}\n",
    "```\n"
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