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<?php
 
$str = 'Синее. Море';
 
preg_match('/^\w+/u', $str, $match);
var_dump($match);
die('end');

Success #stdin #stdout 0.03s 52480KB

stdin

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Standard input is empty

stdout

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array(1) {
  [0]=>
  string(10) "Синее"
}
end

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PHP (php 7.3.5)

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