week nine homework

jingdai/RegularExpression.py

@@ -0,0 +1,27 @@
+import re
+
+string='please help me to find numbers like ABC-123-4567#, YBN-345-8970*'
+
+regex=re.compile(r'\w\w\w-\d\d\d-\d\d\d\d\S')
+
+result= regex.search(string)
+
+print(result.group())
+
+# try group the pattern individually
+
+regex=re.compile(r'(\w\w\w)-(\d\d\d)-(\d\d\d\d\S)') # r for raw_string
+
+result= regex.search(string)
+
+print(result.group(3))
+
+print(result.groups()) # return a tuple
+
+# search function only returns first occurrence , how to return all occurrence?
+
+regex=re.compile(r'\w\w\w-\d\d\d-\d\d\d\d\S')
+results= regex.findall(string)
+print(results)
+
+

jingdai/Regular_Expression.ipynb

@@ -0,0 +1,230 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import re"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "string='please help me to find numbers like ABC-123-4567#, YBN-345-8970*'"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "regex=re.compile(r'\\w\\w\\w-\\d\\d\\d-\\d\\d\\d\\d\\S')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\\w for letter, \\d for number, \\S for any characters that is not a space, tab or newline; r for raw_string"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "result= regex.search(string)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ABC-123-4567#\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(result.group())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "# try group the pattern individually"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "regex=re.compile(r'(\\w\\w\\w)-(\\d\\d\\d)-(\\d\\d\\d\\d\\S)') # r for raw_string"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "result= regex.search(string)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "4567#\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(result.group(3))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "('ABC', '123', '4567#')\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(result.groups()) # return a tuple"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#search function only returns first occurrence , how to return all occurrence?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "regex=re.compile(r'\\w\\w\\w-\\d\\d\\d-\\d\\d\\d\\d\\S')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "results= regex.findall(string)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['ABC-123-4567#', 'YBN-345-8970*']\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(results)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "note: .findall() returns a list"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "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": "3.4.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}