{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Regular Expressions"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Basic Matching"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<re.Match object; span=(2, 5), match='aza'>\n",
      "<re.Match object; span=(1, 4), match='aza'>\n",
      "None\n",
      "<re.Match object; span=(0, 1), match='x'>\n",
      "<re.Match object; span=(4, 8), match='ping'>\n",
      "<re.Match object; span=(1, 5), match='pong'>\n",
      "<re.Match object; span=(0, 4), match='Pang'>\n",
      "<re.Match object; span=(0, 6), match='Python'>\n",
      "<re.Match object; span=(18, 22), match='hway'>\n",
      "None\n",
      "<re.Match object; span=(0, 6), match='cloudy'>\n",
      "<re.Match object; span=(0, 6), match='cloud9'>\n",
      "<re.Match object; span=(4, 5), match=' '>\n",
      "<re.Match object; span=(30, 31), match='.'>\n",
      "<re.Match object; span=(7, 10), match='cat'>\n",
      "<re.Match object; span=(7, 10), match='dog'>\n",
      "<re.Match object; span=(12, 15), match='dog'>\n",
      "<re.Match object; span=(7, 10), match='cat'>\n",
      "<re.Match object; span=(7, 10), match='dog'>\n",
      "<re.Match object; span=(12, 15), match='dog'>\n",
      "['dog', 'cat']\n"
     ]
    }
   ],
   "source": [
    "import re\n",
    "result1 = re.search(r\"aza\", \"plaza\")\n",
    "result2 = re.search(r\"aza\", \"bazaar\")\n",
    "print(result1)\n",
    "print(result2)\n",
    "print(re.search(r\"aza\", \"maze\"))\n",
    "print(re.search(r\"^x\", \"xenon\"))\n",
    "print(re.search(r\"p.ng\", \"clapping\"))\n",
    "print(re.search(r\"p.ng\", \"sponge\"))\n",
    "print(re.search(r\"p.ng\", \"Pangaea\", re.IGNORECASE))\n",
    "print(re.search(r\"[Pp]ython\", \"Python\"))\n",
    "print(re.search(r\"[a-z]way\", \"The end of the highway\"))\n",
    "print(re.search(r\"[a-z]way\", \"What a way to go\"))\n",
    "print(re.search(\"cloud[a-zA-Z0-9]\", \"cloudy\"))\n",
    "print(re.search(\"cloud[a-zA-Z0-9]\", \"cloud9\"))\n",
    "print(re.search(r\"[^a-zA-Z]\", \"This is a sentence with spaces.\"))\n",
    "print(re.search(r\"[^a-zA-Z ]\", \"This is a sentence with spaces.\"))\n",
    "print(re.search(r\"cat|dog\", \"I like cats.\"))\n",
    "print(re.search(r\"cat|dog\", \"I love dogs!\"))\n",
    "print(re.search(r\"cat|dog\", \"I like both dogs and cats.\"))\n",
    "print(re.search(r\"cat|dog\", \"I like cats.\"))\n",
    "print(re.search(r\"cat|dog\", \"I love dogs!\"))\n",
    "print(re.search(r\"cat|dog\", \"I like both dogs and cats.\"))\n",
    "print(re.findall(r\"cat|dog\", \"I like both dogs and cats.\"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "False\n",
      "True\n",
      "True\n",
      "False\n",
      "True\n",
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "import re\n",
    "def check_aei (text):\n",
    "  result = re.search(r\"a.e.i\", text)\n",
    "  return result != None\n",
    "\n",
    "print(check_aei(\"academia\")) # True\n",
    "print(check_aei(\"aerial\")) # False\n",
    "print(check_aei(\"paramedic\")) # True\n",
    "\n",
    "def check_punctuation (text):\n",
    "  result = re.search(r\"[,.:;?!]\", text)\n",
    "  return result != None\n",
    "\n",
    "print(check_punctuation(\"This is a sentence that ends with a period.\")) # True\n",
    "print(check_punctuation(\"This is a sentence fragment without a period\")) # False\n",
    "print(check_punctuation(\"Aren't regular expressions awesome?\")) # True\n",
    "print(check_punctuation(\"Wow! We're really picking up some steam now!\")) # True\n",
    "print(check_punctuation(\"End of the line\")) # False"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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