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<?php
 
$text = "Ты думал что познал";
 
preg_match_all('/(\w+\sчто)(?:.*?\s)(\w+\sа\s)/u', $text, $matches);
 
var_dump($matches);

Success #stdin #stdout 0.02s 52432KB

stdin

Standard input is empty

stdout

array(3) {
  [0]=>
  array(0) {
  }
  [1]=>
  array(0) {
  }
  [2]=>
  array(0) {
  }
}

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