#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11137926
use warnings;
use Data::Dump 'dd';

my @tests = (
             #  q{all '- and "-quotes properly balanced},
             [ q{This is simple.},           [ q{This}, q{is}, q{simpl
+e.}               ] ],
             [ q{     This  is   simple. },  [ q{This}, q{is}, q{simpl
+e.}               ] ],
             [ q{This is "so very simple".}, [ q{This}, q{is}, q{"so v
+ery simple".}     ] ],
             [ q{This "is so" very simple.}, [ q{This}, q{"is so"}, q{
+very}, q{simple.} ] ],
             [ q{This 'isn\'t nice.'},       [ q{This}, q{'isn\'t nice
+.'}               ] ],
             [ q{This "isn\"t nice."},       [ q{This}, q{"isn\"t nice
+."}               ] ],
             [ q{This 'isn\\\\'t nice.'},    [ q{This}, q{'isn\\\\'t},
+ q{nice.'}        ] ],
             [ q{This "isn\\\\"t nice."},    [ q{This}, q{"isn\\\\"t},
+ q{nice."}        ] ],
             [ q{This 'is not unnice.'},     [ q{This}, q{'is not unni
+ce.'}             ] ],
             [ q{This "is not unnice."},     [ q{This}, q{"is not unni
+ce."}             ] ],
             [ q{a "bb cc" d},               [ q{a}, q{"bb cc"}, q{d} 
+                  ] ],

             #  q{UNbalanced '- and "-quotes at absolute end of string
+},
             [ q{This is "so very simple}, [ q{This}, q{is}, q{"so ver
+y simple} ] ],
             [ q{This 'isn\'t nice.},      [ q{This}, q{'isn\'t nice.}
+          ] ],
             [ q{This "isn\"t nice.},      [ q{This}, q{"isn\"t nice.}
+          ] ],
             [ q{This 'isn\\\\'t nice.},   [ q{This}, q{'isn\\\\'t}, q
+{nice.}   ] ],
             [ q{This "isn\\\\"t nice.},   [ q{This}, q{"isn\\\\"t}, q
+{nice.}   ] ],
             [ q{This 'is not unnice.},    [ q{This}, q{'is not unnice
+.}        ] ],
             [ q{This "is not unnice.},    [ q{This}, q{"is not unnice
+.}        ] ],

             #  'what about these questionable cases?',
             [ q{is this"really so"simple now?}, [ q{is}, q{this"reall
+y so"simple}, q{now?} ] ],
             [ q{is this"really so"       now?}, [ q{is}, q{this"reall
+y so"},       q{now?} ] ],
             [ q{is     "really so"simple now?}, [ q{is}, q{"really so
+"simple},     q{now?} ] ],
             [ q{is this'really so'simple now?}, [ q{is}, q{this'reall
+y so'simple}, q{now?} ] ],
             [ q{is this'really so'       now?}, [ q{is}, q{this'reall
+y so'},       q{now?} ] ],
             [ q{is     'really so'simple now?}, [ q{is}, q{'really so
+'simple},     q{now?} ] ],
             [ q{is really\\ so\\ simple now?}, [ q{is}, q{really\\ so
+\\ simple}, q{now?} ] ],

            );

my $regex = qr/(?:
    '(?: \\. | [^'\\] )*' # single quoted string
    |
    "(?: \\. | [^"\\] )*" # double quoted string
    |
    ['"].*                # unmatched quote
    |
    \\.                   # escaped character
    |
    \S                    # single non-space character
    )+/x;

my $passcount = 0;
for ( @tests )
  {
  my ( $string, $want ) = @$_;
  my @out = $string =~ /$regex/g;
  local $" = "\0"x5; # just some array element boundary separator
  "@$want" eq "@out" ? $passcount++ :
    dd "$string => FAILED got", \@out, ' wanted ', $want;
  }
print "$passcount of @{[scalar @tests]} passed\n";
[download]

Outputs:

25 of 25 passed
[download]

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