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\b

(?:(?<=\w)(?!\w)|(?<!\w)(?=\w))

(?:(?<=[\w-])(?![\w-])|(?<![\w-])(?=[\w-]))

my $my_slash_b = qr/(?:(?<=[\w-])(?![\w-])|(?<![\w-])(?=[\w-]))/;

/$my_slash_b$check$my_slash_b/

/(?<![\w-])$check(?![\w-])/

my $my_slash_b = qr/(?:(?<=\S)(?!\S)|(?<!\S)(?=\S))/;

/$my_slash_b$check$my_slash_b/

/(?<!\S)$check(?!\S)/