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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match('~(*UTF)\d{4,8}\sруб\b~u', '50000 рублей', $rg), $rg);
Output for 5.3.24 - 5.3.29, 5.4.14 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) array(0) { }
Output for 5.3.7 - 5.3.23, 5.4.0 - 5.4.13
Warning: preg_match(): Compilation failed: (*VERB) not recognized at offset 5 in /in/C48ZS on line 2 bool(false) NULL