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run code in 500+ PHP versions simultaneously
<?php preg_match('/.+\s\(ID:?(.*)\)$/', 'abc (xyz) (ID:http://ex () ample.com)', $match); print_r($match); preg_match('/.+\s\(ID:(.*)\)$/', 'abc (xyz) (ID:123456)', $match); print_r($match);

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93.86 ms | 2036 KiB | 5 Q