Exercise: Parse ini file

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An ini file has sections starting by the name of the section in square brackets and within each section there are key = value pairs with optional spaces around the "=" sign. The keys can only contain letters, numbers, underscore or dash. In addition there can be empty lines and lines starting with # which are comments.

Given a filename, generate a 2 dimensional hash and then print it out. Example ini file:

examples/regex/inifile.ini

# comment
[alpha]
 
base  = moon
ship= alpha 3
 
[earth]
   # ?
base=London   
ship=  x-wing

If you print it, it should look like this (except of the nice formatting).

{
    'alpha': {
        'base': 'moon',
        'ship': 'alpha 3'
     },
     'earth': {
         'base': 'London',
         'ship': 'x-wing'
     }
}