> This (perl -n -we 'print if /[\[\].]{2}/;' file) almost did the trick, but
> it was also picking up lines  with many .......... or many ........
flanked
> in between something. So I ammended it to (as there is always a space
> between the characters I am trying to pull out):
>
> perl -n -we 'print if /\s[\[\].]{2}\s/;' file | more

It will also grab [[ and ]] and ][ which don't appear possible from your
original example.  If you only want [ or . in the first position and . or ]
in the second and want to exclude [[, ]], and ][, then try:

perl -n -we 'print if /\s[\[.][\].]\s/;' file | more

> > > > something    digits/digits      digits    digits    ..    digits
> > > > digits    ..    digits    digits.digits
> > > > something    digits/digits      digits    digits    ..    digits
> > > > digits    .]    digits    digits.digits
> > > > something    digits/digits      digits    digits    ..    digits
> > > > digits    [.    digits    digits.digits
> > > > something    digits/digits      digits    digits    ..    digits
> > > > digits    []    digits    digits.digits
> > > > something    digits/digits      digits    digits    [.    digits
> > > > digits    .]     digits    digits.digits
> > > > something    digits/digits      digits    digits    []    digits
> > > > digits    []    digits    digits.digits
> > > > something    digits/digits      digits    digits    [.    digits
> > > > digits    ..     digits    digits.digits
> > > > something    digits/digits      digits    digits    [.    digits
> > > > digits    []    digits    digits.digits
> > > > something    digits/digits      digits    digits    []    digits
> > > > digits    ..    digits    digits.digits
> > > > something    digits/digits      digits    digits    .]    digits
> > > > digits    ..     digits    digits.digits
> > > > something    digits/digits      digits    digits    [.    digits
> > > > digits    [.     digits    digits.digits
> > > > something    digits/digits      digits    digits    .]    digits
> > > > digits    .]     digits    digits.digits
> > > > something    digits/digits      digits    digits    .]    digits
> > > > digits     [.    digits    digits.digits



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