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    "# Splitting 'ref' into book, chapter, verse and word \n",
    "\n",
    "The XML source data contains a tag called 'ref' which contains information related to book, chapter, verse and word. See following sniplet:\n",
    "\n",
    "```\n",
    "    <w role=\"v\"\n",
    "    ref=\"MAT 25:10!18\"\n",
    "    after=\" \"\n",
    "    class=\"verb\"\n",
    "    xml:id=\"n40025010018\"\n",
    "    lemma=\"κλείω\"\n",
    "    normalized=\"ἐκλείσθη\"\n",
    "    strong=\"2808\"\n",
    "    number=\"singular\"\n",
    "    person=\"third\"\n",
    "    tense=\"aorist\"\n",
    "    voice=\"passive\"\n",
    "    mood=\"indicative\"\n",
    "    gloss=\"was shut\"\n",
    "    domain=\"079024\"\n",
    "    ln=\"79.112\"\n",
    "    morph=\"V-API-3S\"\n",
    "    unicode=\"ἐκλείσθη\"\n",
    "    frame=\"A1:n40025010020\">ἐκλείσθη</w>\n",
    "```\n",
    "\n",
    "This small Jupyter Notebook explains how this compound variable 'ref' is split into 4 values:"
   ]
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     "text": [
      "['MAT', '25', '10', '18']\n"
     ]
    }
   ],
   "source": [
    "import re\n",
    "input=\"MAT 25:10!18\"\n",
    "x= re.sub(r'[!: ]',\" \", input).split()\n",
    "print (x)"
   ]
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    "## Explanation of the code:\n",
    "\n",
    "The code begins by importing the regular expression module re to work with regular expressions.\n",
    "\n",
    "* The variable input is initialized with the string \"MAT 1:1!1\". This string contains various punctuation marks and spaces.\n",
    "\n",
    "* The re.sub() function is used to substitute certain characters in the input string with a space character (\" \"). The regular expression pattern [!: ] matches any occurrence of either a colon (:), an exclamation mark (!), or a space character. The matched characters are replaced with a space.\n",
    "\n",
    "* The result of the substitution operation is assigned to the variable x. This variable now holds the modified string where the matched characters have been replaced with spaces.\n",
    "\n",
    "* The split() method is then called on the modified string x. This method splits the string into a list of substrings based on whitespace. Since no specific delimiter is provided to the split() method, it uses whitespace (spaces) as the default delimiter.\n",
    "\n",
    "* The resulting list, containing the substrings after the split operation, is printed using the print() function."
   ]
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   "id": "a5e4bdf3-b108-4c6a-b99b-a4bf4723afee",
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   "source": [
    "The following site can be used to build and verify a regular expression: [regex101.com](https://regex101.com/) (choose the 'Pyton flavor') "
   ]
  },
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