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my $kind;
my $REGEX  = qr/
...
        | \x27 ( (?:[^\x27] | \x27{2})* ) \x27 (?{$kind = 'STRING';})
        | \S                                   (?{$kind = 'OTHER';})
        /xs;

my $IDENT  = qr/ [A-Za-z][\w]*                        /xs;
my $STRING = qr/ \x27 ( (?:[^\x27] | \x27{2})* ) \x27 /xs;
...
        | $STRING   (?{$kind = 'STRING';})
        | \S        (?{$kind = 'OTHER';})
        /xs;