Regex:

  
NODE                     EXPLANATION
--------------------------------------------------------------------------------
  insource:/               'insource:/'
--------------------------------------------------------------------------------
  \{                       '{'
--------------------------------------------------------------------------------
  \{                       '{'
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  [Ii]                     any character of: 'I', 'i'
--------------------------------------------------------------------------------
  nternetquelle            'nternetquelle'
--------------------------------------------------------------------------------
  .*                       any character except \n (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  [Aa]                     any character of: 'A', 'a'
--------------------------------------------------------------------------------
  utor                     'utor'
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  =                        '='
--------------------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  Lieschen/                'Lieschen/'