def sed(filename, before, after, flags='g'):
"""
Search and replaces the given pattern on filename.
:param filename: relative or absolute file path.
:param before: expression to be replaced (see 'man sed')
:param after: expression to replace with (see 'man sed')
:param flags: sed-compatible regex flags in example, to make
the search and replace case insensitive, specify ``flags="i"``.
The ``g`` flag is always specified regardless, so you do not
need to remember to include it when overriding this parameter.
:returns: If the sed command exit code was zero then return,
otherwise raise CalledProcessError.
"""
expression = r's/{0}/{1}/{2}'.format(before,
after, flags)
return subprocess.check_call(["sed", "-i", "-r", "-e",
expression,
os.path.expanduser(filename)])
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