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<?php
 
$str = '#форум программистов #форум экономистов #форум
';
 
$str = preg_replace('~^(?:#[^#]+?(?:[^#]+?)?)*\n~m', '', $str);
 
var_dump($str);

Success #stdin #stdout 0.01s 24216KB

stdin

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Standard input is empty

stdout

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string(0) ""

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language:

PHP (php 7.3.5)

created:

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public

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