#!/usr/bin/python
 
import re
 
all_lines = '#hello\n#monica, how re "u?\n#hello#robert\necho'
 
regex = re.compile(
    r'''\#             # first hash
        .*             # continues to (note: .* greedy)
        \#             # last hash
        .*?$           # rest of the line. (note .*? non-greedy)
    ''',
    # Flags: 
    #   DOTALL: Make the '.' match any character at all, including a newline
    #   VERBOSE: Allow comments in pattern
    #   MULTILINE: Allow $ to match end of line
    re.DOTALL | re.VERBOSE | re.MULTILINE)
 
print re.search(regex, all_lines).group()

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