Regular Expressions (regex).ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "6d16d334",
   "metadata": {},
   "outputs": [],
   "source": [
    "import re"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "98517c99",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Exist\n"
     ]
    }
   ],
   "source": [
    "text = \"This is Rahul Gupta !!! and this is a good day\"\n",
    "if re.search(\"good\",text):\n",
    "    print(\"Exist\")\n",
    "else:\n",
    "    print(\"not exist\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e94994da",
   "metadata": {},
   "source": [
    "# Tokenization"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "dcb3a943",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['',\n",
       " 'one can make a coffee . ',\n",
       " 'one can win the game . ',\n",
       " 'one can make it happen. ']"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "text = \"anyone can make a coffee . anyone can win the game . anyone can make it happen. \"\n",
    "re.split(\"any\",text)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "d79f0eec",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['any', 'any', 'any']"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('any',text)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "ac9f5620",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<re.Match object; span=(0, 3), match='any'>"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.search('any',text)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "251a2da1",
   "metadata": {},
   "source": [
    "# Patterns"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "34b688b0",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A']"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "grades = \"ABCAABCCCDAABBBBCCAABCAAABCCCCD\"\n",
    "re.findall('A',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "53651790",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['A',\n",
       " 'B',\n",
       " 'A',\n",
       " 'A',\n",
       " 'B',\n",
       " 'A',\n",
       " 'A',\n",
       " 'B',\n",
       " 'B',\n",
       " 'B',\n",
       " 'B',\n",
       " 'A',\n",
       " 'A',\n",
       " 'B',\n",
       " 'A',\n",
       " 'A',\n",
       " 'B']"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('[AB]',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "031ea978",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['AB', 'AB', 'AB', 'AB', 'AB']"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('[A][B]',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "a425cc1c",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['AB', 'AB', 'CD', 'AB', 'AB', 'AB', 'CD']"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('AB|CD',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "18f63cd0",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['B',\n",
       " 'C',\n",
       " 'B',\n",
       " 'C',\n",
       " 'C',\n",
       " 'C',\n",
       " 'D',\n",
       " 'B',\n",
       " 'B',\n",
       " 'B',\n",
       " 'B',\n",
       " 'C',\n",
       " 'C',\n",
       " 'B',\n",
       " 'C',\n",
       " 'B',\n",
       " 'C',\n",
       " 'C',\n",
       " 'C',\n",
       " 'C',\n",
       " 'D']"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('[^A]',grades)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7f7a1e84",
   "metadata": {},
   "source": [
    "# Quantifiers"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "c204afed",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['AA', 'AA', 'AA', 'AAA']"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('A{2,10}',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "id": "9c357177",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['AA', 'AA', 'AA', 'AAA']"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('A{2,3}',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "e8bcdf93",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['AABCCCD', 'AAABCCCCD']"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "re.findall('A{1,10}B{1,10}C{1,10}D{1,10}',grades)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "5525b766",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "HELLO Rahul !!!\n"
     ]
    }
   ],
   "source": [
    "text = 'rahul@gmail.com'\n",
    "a = re.split(\"@\",text)\n",
    "name = a[0].capitalize()\n",
    "print(f\"HELLO {name} !!!\")"
   ]
  }
 ],
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