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

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

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

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

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