diff --git a/Sanjay/Regular_Expression.ipynb b/Sanjay/Regular_Expression.ipynb
new file mode 100644
index 0000000..6b06a45
--- /dev/null
+++ b/Sanjay/Regular_Expression.ipynb
@@ -0,0 +1,418 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "id": "xMLU30SQxZCH"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "cat\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which gives output as:- 'cat' in str.\n",
+    "import re\n",
+    "str = 'cat mat bat rat'\n",
+    "output=re.match(r\"c\\w\\w\",str)\n",
+    "if output : \n",
+    "    print(output.group())\n",
+    "else : \n",
+    "    print(\"No such word found\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "id": "zMiSTGMHx6Dv"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "rat\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which gives output as:- 'rat' in str.\n",
+    "import re\n",
+    "str = 'cat mat bat rat'\n",
+    "output=re.search(r\"r\\w\\w\",str)\n",
+    "if output : \n",
+    "    print(output.group())\n",
+    "else : \n",
+    "    print(\"No such word found\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "id": "qBoYFjf5x6Mm"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['mat', 'man']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which gives output as:- ['mat', 'man'] in str.\n",
+    "import re\n",
+    "str = 'cat mat bat rat man'\n",
+    "output=re.findall(r\"m\\w\\w\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {
+    "id": "qmxmqzX_x6QR"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Python', 's', 'Programming', 'is', 'very', 'easy', 'to', 'learn']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which gives output as:- \n",
+    "#['Python', 's', 'Programming', 'is', 'very', 'easy', 'to', 'learn'] in str.\n",
+    "import re\n",
+    "str = \"Python's Programming: is very easy to learn\"\n",
+    "output=re.split(r\"\\W+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "metadata": {
+    "id": "LxGl1o7px6Vi"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Python Programming: is very easy to learn\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which gives output as:- Python Programming: is very easy to learn in str.\n",
+    "import re\n",
+    "str = \"Python's Programming: is very easy to learn\"\n",
+    "output=re.split(r\"'\\w\",str)\n",
+    "print(\"\".join(output))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {
+    "id": "9uIpb614x6Yb"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['peter', 'per', 'picked', 'peck', 'pickled', 'peppers']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words starting with p.\n",
+    "#Output:- ['peter', 'per', 'picked', 'peck', 'pickled', 'peppers']\n",
+    "import re\n",
+    "str = \"peter giper picked a peck of pickled peppers\"\n",
+    "output=re.findall(r\"p\\w+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {
+    "id": "N0vFkePdx6bN"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['peter', 'picked', 'peck', 'pickled', 'peppers']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words starting with p except 'per' which is not a separate word.\n",
+    "#Output:- ['peter', 'picked', 'peck', 'pickled', 'peppers']\n",
+    "import re\n",
+    "str = \"peter giper picked a peck of pickled peppers\"\n",
+    "output=re.findall(r\"\\bp\\w+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "metadata": {
+    "id": "mbiypO3yx6eE"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['8th', '11th']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words starting with a digit.\n",
+    "#Output:- ['8th', '11th']\n",
+    "import re\n",
+    "str = 'The election in delhi will be held on 8th and result for the same will be declared on 11th'\n",
+    "output=re.findall(r\"\\d\\w+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "metadata": {
+    "id": "6ZUWWd6bx6g8"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['peter', 'giper']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words having 5 characters.\n",
+    "#Output:- ['peter', 'giper']\n",
+    "import re\n",
+    "str = \"peter giper picked a peck of pickled peppers\"\n",
+    "output=re.findall(r\"\\b\\w{5}\\b\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "metadata": {
+    "id": "syuXvEXox6jt"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Retrieving', 'words', 'having', 'least', 'characters']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words having at least 4 characters.\n",
+    "#Output:- ['Retrieving',  'words', 'having', 'least', 'characters']\n",
+    "import re\n",
+    "str = \"Retrieving all words having at least 4 characters\"\n",
+    "output=re.findall(r\"\\b\\w{4,}\\b\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "metadata": {
+    "id": "MtXo1Hf8x6ma"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['all', 'words', 'least']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves all words having at characters between 3 to 5 words.\n",
+    "#Output:- ['all', 'words', 'least']\n",
+    "import re\n",
+    "str = \"Retrieving all words having at least 4 characters\"\n",
+    "output=re.findall(r\"\\b\\w{3,5}\\b\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 35,
+   "metadata": {
+    "id": "RlvMct7xx6pE"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['8', '11']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves only digits from the string.\n",
+    "#Output:- ['8', '11']\n",
+    "import re\n",
+    "str = 'The election in delhi will be held on 8 and result for the same will be declared on 11'\n",
+    "output=re.findall(r\"\\d+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 64,
+   "metadata": {
+    "id": "wdD4cSyJx6us"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "characters\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves last word if starts with c from the given string.\n",
+    "#Output:- ['characters']\n",
+    "import re\n",
+    "str = \"Retrieving all words having at least 4 characters\"\n",
+    "output=re.search(r\"c\\w+$\",str)\n",
+    "if output : \n",
+    "    print(output.group())\n",
+    "else : \n",
+    "    print(\"No such word found\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 38,
+   "metadata": {
+    "id": "HsVGzJVbx6sl"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['1234567890']\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Write the regular expression and use proper method which Retrieves a phone number from the given string.\n",
+    "#Output:- 1234567890\n",
+    "import re\n",
+    "str = \"Learnbay : 1234567890\"\n",
+    "output=re.findall(r\"\\d+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 39,
+   "metadata": {
+    "id": "LvG3jTtvyQKk"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['Learnbay : ']\n"
+     ]
+    }
+   ],
+   "source": [
+    "##Write the regular expression and use proper method which Etracts name from the string but not number.\n",
+    "#Output:- Learnbay : \n",
+    "import re\n",
+    "str = \"Learnbay : 1234567890\"\n",
+    "output=re.findall(r\"\\D+\",str)\n",
+    "print(output)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 45,
+   "metadata": {
+    "id": "drArGXgKyQNz"
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['anil', 'akhil', 'anant', 'ankur']\n"
+     ]
+    }
+   ],
+   "source": [
+    "##Write the regular expression and use proper method which Retrieves name starting with 'an' or 'ak'.\n",
+    "#Output:- ['anil', 'akhil', 'anant', 'ankur']\n",
+    "import re\n",
+    "str = 'anil akhil anant abhi arun arati arundhati abhijit ankur'\n",
+    "output=re.findall(r\"a[nk]\\w+\",str)\n",
+    "print(output)\n"
+   ]
+  }
+ ],
+ "metadata": {
+  "colab": {
+   "name": "Regular_Expression.ipynb",
+   "provenance": []
+  },
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.8"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 1
+}