#python 3.6 
#蔡军生  
#http://blog.csdn.net/caimouse/article/details/51749579 
# 
import re 
 
text = 'This is some text -- with punctuation.' 
 
print(text) 
print() 
 
patterns = [ 
  r'^(?P<first_word>\w+)', 
  r'(?P<last_word>\w+)\S*$', 
  r'(?P<t_word>\bt\w+)\W+(?P<other_word>\w+)', 
  r'(?P<ends_with_t>\w+t)\b', 
] 
 
for pattern in patterns: 
  regex = re.compile(pattern) 
  match = regex.search(text) 
  print("'{}'".format(pattern)) 
  print(' ', match.groups()) 
  print(' ', match.groupdict()) 
  print() 

This is some text -- with punctuation.

'^(?P<first_word>\w+)'
  ('This',)
  {'first_word': 'This'}

'(?P<last_word>\w+)\S*$'
  ('punctuation',)
  {'last_word': 'punctuation'}

'(?P<t_word>\bt\w+)\W+(?P<other_word>\w+)'
  ('text', 'with')
  {'t_word': 'text', 'other_word': 'with'}

'(?P<ends_with_t>\w+t)\b'
  ('text',)
  {'ends_with_t': 'text'}