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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match('~(*UTF8)\d{4,8}\sруб\b~u', '50000 рублей', $rg), $rg);
Output for 5.3.7 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) array(0) { }