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  1. import re
  2.  
  3. text = """System Id     Interface          Circuit Id        State HoldTime Type     PRI
  4. --------------------------------------------------------------------------------
  5. rtr1.lab01.some GE0/0/1            0000000001         Up   22s      L2       --
  6. thing
  7. rtr2.lab01.some GE0/0/2            0000000002         Up   24s      L2       --
  8. thingelse
  9. rtr2.lab01.abcd GE0/0/4            0000000003         Up   24s      L2       --
  10. rtr2.lab01.none GE0/0/24           0000000004         Up   24s      L2       --
  11. sense
  12. rtr2.lab01.efgh GE0/0/5            0000000003         Up   24s      L2       --
  13. """
  14.  
  15. lines = text.rstrip().split('\n')[2:]
  16. n_lines = len(lines)
  17. current_line = -1
  18.  
  19. def get_next_line():
  20.     # Actual implementation would be reading from a file and yielding lines one line at a time
  21.     global n_lines, current_line, lines
  22.     current_line += 1
  23.     # return special sentinel if "end of file"
  24.     return  lines[current_line] if current_line < n_lines else '$'
  25.  
  26.  
  27. def get_system_id():
  28.     line = None
  29.     while line != '$': # loop until end of file
  30.         if line is None: # no current line
  31.             line = get_next_line()
  32.             if line == '$': # end of file
  33.                 return
  34.         m = re.search(r'^([a-zA-Z0-9][a-zA-Z0-9.-]+[a-zA-Z0-9])', line)
  35.         id = m[1]
  36.         line = get_next_line() # might be sentinel
  37.         if line != '$' and re.match(r'^[a-zA-Z0-9]+$', line): # next line just single id?
  38.             id += line
  39.             line = None # will need new line
  40.         yield id
  41.  
  42. for id in get_system_id():
  43.     print(id)
  44.  
Success #stdin #stdout 0.02s 9388KB
comments ()
stdin
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Standard input is empty
stdout
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rtr1.lab01.something
rtr2.lab01.somethingelse
rtr2.lab01.abcd
rtr2.lab01.nonesense
rtr2.lab01.efgh
https://ideone.com/79qpnY
language:
Python 3 (python  3.12)
created:
5 years ago
visibility:
public

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