Найти в тексте очень длинные слова

$str='
Girl you did me wrong, one too many times
Can`t believe that you told me these lies
I`m still wasting time getting you off my mind
I got to let go or you`ll be my demiseccsdfasdfddddddddddddddasdfasdfasdfasdfasdf
Oh I don`t know the deal, tell me was it real?
If I never know thе reason then I won`t know how to feel
You know what you been doing to me, you lеft me in the field
And now I`m stuck here on my own, reminiscing with them fearsaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
I gave you everything you got, and bought youuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu anything you wanted
Yeah you did me wrong but I kept going
This the last time, I won`t miss any moments
You grew too cold, I can`t take any more of this';

$str = "reminiscing with them fearsaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
I gave you everything you got, and bought youuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu anything you wanted";
preg_match_all('/[a-zа-я]{35,}/uis', $str, $matches);
echo "<pre style='white-space:pre-wrap;'>";
print_r($matches);
echo "</pre>";