import re
x = re.compile(r'\d\d\d-\d\d\d\d')
y = x.search('The phone number is 444-4444')
print(y.group())

import re
x = re.compile(r'(\d\d\d)-(\d\d\d\d)')
y = x.search('The phone number is 444-4444')
print(y.group(2))

import re
x = re.compile(r'(\d\d\d)-(\d\d\d\d)')
y = x.search('The phone number is 444-4444')
print(y.group(1))

import re
x = re.compile(r'(\d\d\d)-(\d\d\d\d)')
y = x.search('The phone number is 444-4444')
print(y.group(0))

import re
x = re.compile(r'(\d\d\d)-(\d\d\d\d)')
y = x.search('The phone number is 444-4444')
print(y.groups())

import re
x = re.compile(r'(\(\d\d\d\))-(\d\d\d\d)')
y = x.search('The phone number is (444)-4444')
print(y.group(1))

import re
x = re.compile(r'Python 2|Python 3')
y = x.search('Python 3 MCQ')
print(y.group())

import re
x = re.compile(r'Python 2|Python 3')
y = x.search('Python 2.7')
print(y.group())

import re
x = re.compile(r'day')
y = x.search('Today is a nice day and a Sunday')
print(y.group())

import re
x = re.compile(r'(Sun)?day')
y = x.search('Today is a nice day and a Sunday')
print(y.group())

import re
x = re.compile(r'(Sun|To)?day')
y = x.search('Today is a nice day and a Sunday')
print(y.group())

import re
x = re.compile(r'(Sun)*day')
y = x.search('Today is a nice day and a Sunday')
print(y.group())

import re
x = re.compile(r'(Sun)+day')
y = x.search('Today is a nice day and a Sunday')
print(y.group())

import re
x = re.compile(r'(Python){2}')
y = x.search('PythonPythonPython')
print(y.group())

import re
x = re.compile(r'(Python){2,3}')
y = x.search('PythonPythonPython')
print(y.group())

import re
x = re.compile(r'(Python){1,3}?')
y = x.search('PythonPythonPython')
print(y.group())

import re
x = re.compile(r'day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(Sun)?day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(Sun|To)?day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(Sun)*day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(Sun)+day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(\(\d\d\d\))-(\d\d\d\d)')
y = x.findall('The phone number is (444)-4444')
print(y)

import re
x = re.compile(r'\d')
y = x.findall('The phone number is (444)-4444')
print(y)

import re
x = re.compile(r'\D')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'\w')
y = x.findall('Python_3')
print(y)

import re
x = re.compile(r'\W')
y = x.findall('Python_3')
print(y)

import re
x = re.compile(r'\s')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'\S')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'[0-9]')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'[ptPT]')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'[p-t0-6]')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'[D-S0-2]')
y = x.findall('Python 3')
print(y)

import re
x = re.compile(r'[^A-Za-z0-2]')
y = x.findall('Python_3')
print(y)

import re
x = re.compile(r'^Py')
y = x.search('Python_3')
print(y.group())

import re
x = re.compile(r'3$')
print(x.search('Python_3') == None)

import re
x = re.compile(r'.day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(.*)day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile(r'(.*?)day')
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile('.*')
y = x.search("Today is a nice day.\n Let's go for a walk.\n
We'll also go to the park.")
print(y.group())

import re
x = re.compile('.*', re.DOTALL)
y = x.search("Today is a nice day.\n Let's go for a walk.\n
We'll also go to the park.")
print(y.group())

import re
x = re.compile('Day')
y = x.search('Today is a nice day')
print(y)

import re
x = re.compile('Day', re.I)
y = x.search('Today is a nice day')
print(y.group())

import re
x = re.compile('day', re.IGNORECASE)
y = x.findall('Today is a nice day and a Sunday')
print(y)

import re
x = re.compile('Sunday')
y = x.sub('Wednesday', 'Today is a nice day and a Sunday')
print(y)

import os
x = os.getcwd()
print(x)

import webbrowser
webbrowser.open('http://google.com')

import sys
print(sys.argv)