PL grado ETSII: how to manage multiline assignments in INI files. Node repl session

multiline.ini

[section_one]
one = 1
two = 2

[section_two]
three =         3
multi = multiline \
support

; comments should be ignored
[section three]
four   =4
five=5
six =6

[section_four]
   [section_five]
 seven and eight= 7 & 8

regexp for multilines

> s = 'a=b\\\nc'
'a=b\\\nc'
> n2 = /^([^=;#\r\n]+)=((?:[^;#\r\n]*\\\n)*[^;#\r\n]*)/
/^([^=;#\r\n]+)=((?:[^;#\r\n]*\\\n)*[^;#\r\n]*)/
> m = n2.exec(s)
[ 'a=b\\\nc', 'a', 'b\\\nc',  index: 0, input: 'a=b\\\nc' ]
> d = m[2]
'b\\\nc'
> d.replace(/\\\n/g,' ')
'b c'

Práctica ULL-ETSII-Grado-PL "ficheros INI":

Puedes usar este gist para ver como implantar soporte multiline.
Usa el fichero .ini adjunto para probar su funcionamiento.