<?php var_dump(preg_match('~^(hello\#world)\z~', 'hello#world')); var_dump(preg_match('~^(hello\#world)\z~x', 'hello#world')); var_dump(preg_match('~^(hello#world)\z~', 'hello#world')); var_dump(preg_match('~^(hello#world)\z~x', 'hello#world'));
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